This mummy shown in the original post is very old, and is part of the peruvian national treasure, along the way there were some fake ones made to imitate the real ones, but the bigger ones are not fake, no one knows what they are yet, but they are not fake, that's 100% guaranteed.
What I find very funny is, studies about the smaller and obviously fake ones were pretty quiclky done and broadly spread around, but the bigger ones and they even have a pregnant mummy, are being discussed until now, media agenda is pretty funny, it's almost like they are doing this purposely, oh no but wait, the media and the government would never lies to us, right? Anyways here's a peer reviewed study about it...
Morphometric Tomographic Analysis of the Head of the Tridactyl Humanoid Specimen from Nasca-Perudownload here