The article talks as if the idea that moral judgements are based on feeling or perception rather than on reason is a recent one. As one (important) example, Hume explicitly advocated such a position in the 1700s.

It also seems to confuse moral philosophy and moral psychology. The former can use reason and arguments to attempt to justify practical principles and actions (at least somewhat) independently of how, psychologically, human agents, in fact, make moral judgements in real-life situations.

"The End of Philosophy" is a silly title because, for a start, what is discussed is only relevant to moral philosophy; and secondly, whatever firm scientific results may be produced regarding moral psychology, there are still endless issues that moral philosophers can continue to sensibly discuss, for example, the semantics of (what appear to be) deductive moral arguments.