Hate to rain on anyone's parade, but the man who took the photos in the early 1930's also wrote that "Two years ago the local Dibia, 7.e., mystic or witchdoctor, informed the priest of Uto, a genial old man, that Uto had told the Dibia that it wanted the people of nsude to erect ten Nkpuru (pyramids) in its honour andas a sign to all and sundry that Uto is a great juju and lord and master of nsude.

He described the building of these shrines.

"Two years ago when the ten pyramids were erected it was found that when the lower platform or Nkpuruhad been built there was plenty of roomfor a second Nkpuru, which was therefore built on the top of the first. A third Nkpuru was built on top of the second, and so on until there was only room for a small cone in the centre of the fourth Nkpuruor platform."

These are made of mud and clay and it's not surprising they have eroded.

There's no evidence of this Luke Walter person, all mentions seem to be from this century.

Continuing to research to make sure I haven't missed anything I found a 1921 source about what may be similar pyramids.
"In the neighbourhood of Ngwo, Nsude and Agbaja Owa in the Udi Division, at intervals, the people construct quaint circular pyramids. Clay is used for the purpose. The bases are about sixty feet in circumference and two to three feet in height. Then another section is laid about forty-five feet in circumference and so on until the pinnacle is reached. They are erected to the honour of “ Ala ” and to indicate ownership of land.
Two rows of five are built parallel to one another which means that “ Ala ” gives children with the right hand and the left. The god (or goddess) dwells in the pinnacle and, thus, is in a position to detect any person committing evil. Such a person will be caught by the god and secured with shackles ; these are represented by small sticks inserted in the clay near the tops of the pyramids."[https://www.google.co.uk/books/edition/Among_the_Ibos_of_Nigeria/hKssBgAAQBAJ?hl=en&gbpv=1] P.109 This is the book ''Among the Ibos of Nigeria An Account of the Curious & Interesting Habits, customs, & Beliefs of a Little Known African People by One who Has for Many Years Lived Amongst Them on Close & Intimate Terms''. 1921
This doesn't of course contradict my source above, just shows that these are earlier. We can't know how often these eroded and were replaced.

Continuing to research to make sure I haven't missed anything I found a 1921 source about what may be similar pyramids.
"In the neighbourhood of Ngwo, Nsude and Agbaja Owa in the Udi Division, at intervals, the people construct quaint circular pyramids. Clay is used for the purpose. The bases are about sixty feet in circumference and two to three feet in height. Then another section is laid about forty-five feet in circumference and so on until the pinnacle is reached. They are erected to the honour of “ Ala ” and to indicate ownership of land.
Two rows of five are built parallel to one another which means that “ Ala ” gives children with the right hand and the left. The god (or goddess) dwells in the pinnacle and, thus, is in a position to detect any person committing evil. Such a person will be caught by the god and secured with shackles ; these are represented by small sticks inserted in the clay near the tops of the pyramids."[https://www.google.co.uk/books/edition/Among_the_Ibos_of_Nigeria/hKssBgAAQBAJ?hl=en&gbpv=1] P.109 This is the book ''Among the Ibos of Nigeria An Account of the Curious & Interesting Habits, customs, & Beliefs of a Little Known African People by One who Has for Many Years Lived Amongst Them on Close & Intimate Terms''. 1921

This doesn't of course contradict my source above, just shows that these are earlier. We can't know how often these eroded and were replaced.

Continuing to research to make sure I haven't missed anything I found a 1921 source about what may be similar pyramids.
"In the neighbourhood of Ngwo, Nsude and Agbaja Owa in the Udi Division, at intervals, the people construct quaint circular pyramids. Clay is used for the purpose. The bases are about sixty feet in circumference and two to three feet in height. Then another section is laid about forty-five feet in circumference and so on until the pinnacle is reached. They are erected to the honour of “ Ala ” and to indicate ownership of land.
Two rows of five are built parallel to one another which means that “ Ala ” gives children with the right hand and the left. The god (or goddess) dwells in the pinnacle and, thus, is in a position to detect any person committing evil. Such a person will be caught by the god and secured with shackles ; these are represented by small sticks inserted in the clay near the tops of the pyramids."[https://www.google.co.uk/books/edition/Among_the_Ibos_of_Nigeria/hKssBgAAQBAJ?hl=en&gbpv=1] P.109 This is the book ''Among the Ibos of Nigeria An Account of the Curious & Interesting Habits, customs, & Beliefs of a Little Known African People by One who Has for Many Years Lived Amongst Them on Close & Intimate Terms''. 1921
This doesn't of course contradict my source above, just shows that these are earlier. We can't know how often these eroded and were replaced.

Hate to rain on anyone's parade, but the man who took the photos in the early 1930's also wrote that "Two years ago the local Dibia, 7.e., mystic or witchdoctor, informed the priest of Uto, a genial old man, that Uto had told the Dibia that it wanted the people of Nsude to erect ten Nkpuru (pyramids) in its honour andas a sign to all and sundry that Uto is a great juju and lord and master of Nsude.

He described the building of these shrines.

"Two years ago when the ten pyramids were erected it was found that when the lower platform or Nkpuruhad been built there was plenty of roomfor a second Nkpuru, which was therefore built on the top of the first. A third Nkpuru was built on top of the second, and so on until there was only room for a small cone in the centre of the fourth Nkpuruor platform."

These are made of mud and clay and it's not surprising they have eroded.

There's no evidence of this Luke Walter person, all mentions seem to be from this century.

Hate to rain on anyone's parade, but the man who took the photos in the early 1930's also wrote that "Two years ago the local Dibia, 7.e., mystic or witchdoctor, informed the priest of Uto, a genial old man, that Uto had told the Dibia that it wanted the people of Nsude to erect ten Nkpuru (pyramids) in its honour andas a sign to all and sundry that Uto is a great juju and lord and master of Nsude.

He described the building of these shrines.

"Two years ago when the ten pyramids were erected it was found that when the lower platform or Nkpuruhad been built there was plenty of roomfor a second Nkpuru, which was therefore built on the top of the first. A third Nkpuru was built on top of the second, and so on until there was only room for a small cone in the centre of the fourth Nkpuruor platform."

These are made of mud and clay and it's not surprising they have eroded.

There's no evidence of this Luke Walter person, all mentions seem to be from this century.