Honestly, this whole thing is just ugly. I read what he wrote. It was (mostly) ugly but contained a lot of truth. Before you downvote/call me a Nazi, I'm a mixed race woman in tech. I definitely see people hired just because of their minority status. I also see people hired who are minorities but also great at their job. It's not a binary pattern. But those who are hired just because they are a POC or female, yet are…
I don't think anyone believes in the opposite, that biological difference in gender plays exactly zero part in lack of interest in tech from women. The memo was suggesting this could play a part, but not whether if biological differences are significant or even meaningful.
To the best of my knowledge, we can't disentangle biological from cultural biases across gender. Hunting down biological reasons isn't productive and threatens gender equality initiatives, hence the massive backlash.
Should we question the ideals of gender equality in the workplace? That's probably the discussion the memo wanted to inspire, but it only led to out cries of "sheeple better wake up" and "hell no."