I agree that the author's arguments have been misrepresented, but as much by the author as anyone else. What we have is someone who is trying to couch borderline crazy views as reasonable and thoughtful and is smart enough to keep the lid on his underlying opinions with some success. But, read the author's footnotes for a real tl;dr -- he baldly states without evidence (indeed contrary to all the literature) that women are paid equally for equal work, that political correctness is a tool of leftists and authoritarians, and on and on.

His constant protestations that he's really interested in promoting diversity BUT is just the new "some of my best friends are X, but".