actually, I think the author was pro-diversity but anti-diversity programs. in other words, he's rallying against diversity programs, not diversity.

he also didn't outright claim women/minorities are "inferior" but that biological differences mean they are good at different things and maybe driving them into tech isn't necessarily a good thing. he also further claims we should be looking at each candidate and evaluate their skills as an individual and not because of one of their attributes (i.e. race, gender, religion)

I'd urge you to reread the manifesto and not get too focused on the part with bad science. the author makes some other interesting points.