These have been debunked years ago, and their testing methods are nonsense. For instance:
Tellingly, if the bodies were aliens, then carbon-14 dating would be useless. "Radiocarbon dating is based on Carbon 14 atoms which are created when the sun's radiation strikes the Earth's upper atmosphere," David Anderson, an assistant professor of anthropology who has written about pseudoarchaeology extensively at Radford University in Virginia, told Live Science in an email. "To radiocarbon date extraterrestrial beings, we would have to know what the rate of production of 14-C was on their home planet, not ours."
Also
bodies "have been debunked on the basis of anatomy," with studies showing that some of the bodies "are human mummies that had been deliberately manipulated to appear alien,"
Carbon dating is just one peice. It is extremely expensinve and will be done. But yeah the most critical piece is the dna which was documented proving they are not sheep skulls like the lying media said