the passage mentions the "Palaeolithic origin of the genes of most Europeans", so you can hardly claim it isn't about genes. I think that Alieni's theory is fringy nonsense, and this paragraph is calculated to conjure up the appearance of a consenseus that does not in fact exist in the best tradition of pseudoscholarship. This is best done by wild and erratic mixing of genetics, archaeology, linguistics and anything else that might fit the bill (also known as WP:SYN).  (𒁳)