It's an informal reply on quora from someone we have no verification about that cites exactly one supporting scientific study - and that is about bird mating practices. The rest cites amazon bookstore pages, blogs, articles in general interest magazines, other quora responses, or wikipedia articles (which themselves actually undermine the point she was trying to make - eg skimming the stereotype threat article, consensus seems to be it isn't real). The rest is an attempt to justify calling the author a fascist racist sexist etc. etc. and thereby gloss over the actual question at hand (namely, was he right?).
My education is in physics and CS, so I am not qualified to judge what is accurate in something like evolutionary psychology. But when I see a paper that weasely, juking around the issue while engaging in personal attacks, it inclines me to believe the memo is scientifically valid and this sort of emotion based response is the only one available to its detractors.