I agree with you this is a weak example. Either PG was spouting an empty tautology, "these women [who aren't hackers] aren't hackers", or he was using "these"

I agree with you this is a weak example. Either PG was spouting an empty tautology, "these women [who aren't hackers] aren't hackers", or he was using "these" as a demonstrative article when speaking about the women YC sees to make a more general point about women and technology. You can agree or disagree with whether his roasting was justified, but he wasn't roasted for something he "didn't say" imho.