Is "sexist ideas" fair? "Bigoted ideas"? That seems to be the implication when labeling ideas about gender "toxic". The colloquial language around this sort of thing is imprecise. That brings me to my next point:
> ...and then demonstrating he's not for diversity by arguing against it.
The paper seems contradictory because people have definitions in mind for words like "diversity". But not everyone has the same definitions in mind. He can be for diversity of thought and want to encourage that with discussion of structural changes while still preferring a world with more women in tech. This position is not the Google HR definition of "diversity", but it's clearly part of his idea of diversity.