i did find this about them, still inconclusive though:

"The case may seem fairly enticing, but once you look closer, a strange pattern of fraud begins to emerge. Both of the documentarians seem to be lying about something. Julia-Levy doesn’t appear to be who he claims to be—Raul Julia’s widow has publicly called out a con man named Salvador Alba Fuentes. According to her, Salvador is attempting to ride on her late husband’s fame and is going around telling everyone his name is, yes, Raul Julia-Levy. Meanwhile, Thieriot has shut down the production of the documentary and sued her partner, accusing “Julia-Levy” of stealing her documentary and misusing filming equipment (a statement “Julia-Levy” vehemently opposes). What’s more, there seems to be very little scientific proof of the authenticity of the artifacts, and the pictures that have emerged online are less than concrete evidence. "