https://medium.com/@yonatanzunger/so-about-this-googlers-man...
Notably:
1) The document makes a fundamentally flawed argument - that is, he's based his whole argument on a flawed premise that women just aren't interested in being engineers (and it's clearly wrong, because gender ratios were nearly identical until about the mid 80s; it's not a biological difference, it's a social and cultural difference, which means it has a social and cultural solution). Biological traits vary between genders, but the variance is TINY for most that aren't physical (strength, etc).
2) Even if he were right about men and women being biologically prone to certain traits, those he attributed to women tend to make them better engineers (and especially better engineering managers) anyway.
3) The document has (rightfully) alienated women inside and outside his organization, which makes it impossible for this person to be an effective member of the team. The next time a woman interviews for his team, and he votes against hiring, how does the hiring committee interpret that vote? The next time he's peer reviewed by a woman, how does that review get interpreted? The next time he peer reviews a woman, how does that review get interpreted? The next time a female candidate interviews with the author and is denied, how likely is it that the candidate will believe they had a fair interview, or is the organiation perpetually exposed to increased legal risk forever? Such a manifesto is toxic and shows a profound lack of awareness for any professional.