People can't seem to summarize his argument without getting much of it grossly wrong, because his manifesto was a haphazard collection of good points, bad points, good arguments, lousy arguments, misrepresentations of others' views, and unstated implications. A perfect recipe for people to argue past each other about it.
It's worth remembering that one of his conclusions was to end or replace gender-based diversity programs at Google. Given that, it's easy to understand why people would be upset. If gender-based diversity programs are responsible for qualified women getting jobs that they otherwise wouldn't have gotten due to bias, then the lack of that program means those women wouldn't have gotten those jobs.
It's worth remembering that one of his conclusions was to end or replace gender-based diversity programs at Google. Given that, it's easy to understand why people would be upset. If gender-based diversity programs are responsible for qualified women getting jobs that they otherwise wouldn't have gotten due to bias, then the lack of that program means those women wouldn't have gotten those jobs.