Basically, he sets forward incorrect assertions about biological differences without the self-awareness about why he takes those differences as truth. For instance "Women on average show a higher interest in people and men in things". This is true at least in a very large part because women are socialized from birth to do so. There are dozens of similar examples.
The people unhappy with him are frustrated by always having to make the same damn argument to the same people who somehow think behavioral evolution is the end-all-be-all, as if somehow the computer they're typing on was a natural result of that evolution.
Now, in this particular case I don't think the author had any bad intent, and I think people who disagree should argue straightforwardly and use this as a great, clear opportunity to address the many people who actually do agree with this person but don't speak out. I also think the author has some good feedback when it comes to how dissenting opinions are heard on the left, but it's overshadowed by his lack of understanding of the more serious problem of bias and discrimination of women in tech. (yes, it is a more serious problem than conservatives being unable to express their views - at least they can choose to talk or not, even if I'd rather everyone be able to freely share their views)