> After its initial discovery by farmers in 1966, Balamku was visited by archaeologist Víctor Segovia Pinto

Segovia Pinto reportedly died in 1955, according to this source: https://translate.google.com/translate?hl=&sl=es&tl=en&u=htt...

1955 was 11 years before the reported discovery. Either there is a typo somewhere, or Pinto was not the original discoverer. Pinto was a bit of a celeb at the time, so it's entirely possible that someone erroneously attributed to him what happened in 1966, or that the discovery happened before but was only recorded in 1966.