No, These Are Not The Skulls Of Aliens
They're really, really not.
Brien Foerster claimed that "preliminary results" indicated the Paracas skulls were alien in a video interview with The People's Voice, an internet television station.
It had mtDNA (mitochondrial DNA) with mutations unknown in any human, primate, or animal known so far. But a few fragments I was able to sequence from this sample indicate that if these mutations will hold we are dealing with a new human-like creature, very distant from Homo sapiens, Neanderthals and Denisovans.
But Foerster is yet to publish the results of the DNA testing in a scientific journal.
Until he does, this is just pure speculation. But given the widespread nature of intentional skull deformation in the area, we're betting on a more terrestrial explanation.