If you’re moral realist he’s even more wrong. Of the realist positions available this is closest to naturalism, but it denies the essential precepts of any moral realism viz. the mind-independence of moral truth. This “is-ought” “solution” is as old as Protagoras, “man is the measure of all things”, where “e/acc’s google-brained account of consciousness” stands in for “man”.
As a philosophical position they’re just doing relativism, and then as a historicised political project this is just late 19th century scientism(ific racism). And I emphasise that the premises (“evolutionary fitness”) reveal the sources reveal the political project.
Moral realists introduce an independent condition (mind-independence) which at least purports to save ethical principles from reducing to “might makes right”, this is just the latter window-dressed with talk of “post-selection” to implicitly let in some degree of ethical deliberation as constitutive of morality, making it incidentally also a cowardly way to propagandise racism.
Too stupid to debunk without resorting to bullying.