In a very subtle and non-evident way. He doesn't do it directly, but as a whole, given the 'memo's structure and its tone, it creates wrong assumptions, ignores important points, emphasizes secondary ones, creates doubts where there is nothing to doubt about and doesn't question things that should be questioned instead, which in general presents an incompetent and harmful way of thinking about the subject. It's like someone would write an essay with a list of science-based points on why raping children is natural and suggest to doubt that it is a crime. Its pretty easy to kind of support any bad thing with scientific facts and make it look right, but doing this is bad in the first place. His post provokes subtle doubts on very sensitive things like female competence and questions if diversity is important enough to tolerate a risk of not hiring the most qualified person. Given what we know about the hardships women often face in society and at work, provoking doubts around those subjects does no good. At least, not in the way he presented the whole topic.