He covers that right at the beginning:

> you can’t say anything about an individual given these population level distributions.

His screed is instead concerned with distribution across populations (such as Google's).

Somehow I don’t see a guy who says that women “in general” aren’t as technically capable giving similar weighting’s to a woman who went to a women’s college to a man who went elsewhere.

I think it is clear that he complains the company promote women over men to increase the diversity and that the company should look to the individual skills. That the reason of the difference in the diversity could be biological and not gender bias and that the company should study this as a possibility too. Not ignore it and try to equally the number of females and males in the company