This claim is false. Upon doing research into these "aliens" discovered in Peru, it's clear that James Maussan is spreading misinformation. In September 2023, CBS News published an article stating that Maussan is known to make sensational claims. Maussan has a history of partnering with "pseudoscience entertainment companies rather than scientific institutions" CBS said. The author, Mikayla Price who is a digital producer for CBS Chicago, describes Maussan as a "self-described UFOlogist" and a "self-described journalist."
According to Wikipedia, Maussan was a journalist for several Mexican broadcasting networks since 1970. He was also named on the United Nations Annual Environmental Program Honor Roll in 1990. While Maussan does have a background in journalism, his claims about extraterrestrial life often lack concrete evidence.
In another CBS article, Flavio Estrada, a forensic archaeologist, revealed that the "aliens" Maussan presented to the Mexican congress were actually human-made dolls assembled with synthetic glue. This debunks Maussan's claim.
This is an example of misinformation because the facts Maussan is presenting to the public are false, but he believes they are true.