I'm glad you brought this up. I suspect that someone is going to pipe up and say we need more than "just anecdotal evidence" or something similar. On the face of it, this would seem like a reasonable reply.
Except, I remember when PG said something bizarre about writing being a more important skill than speaking based on his anecdotal experiences of listening to good presenters (!) and everybody here loved it. Certainly nobody asked for data and the most upvoted comments weren't critical of the article.
Pretty much the same thing happened when patio11 wrote a huge document with "advice" for young engineers which as far as I could make out, were based on little more than his experiences making a few bucks selling software on the internet. He too had bizarre advice; for instance, don't go to graduate school. I'll be the first to admit that I don't know if this is good or bad advice. But, even if you buy into the premise of many HNers that anything other than a billion-dollar "exit" is a failure, going to grad school certainly worked out well for Sergei and Larry. Again, I don't remember any comments asking for data supporting patio11's assertions. Everybody just lapped it up.
Now I'm not trying to diss either PG or patio11. These guys have been "successful" and perhaps what they have to say could be useful to others here. That said, I've been watching threads on gender issues on HN for about two years now, and I definitely believe that these articles are held to different standards than all the other articles here.
I also see highly upvoted ragingly misogynistic articles. I remember one by a east-european developer literally saying that he would never hire women because they could potentially get pregnant (you can't make this shit up!). I'm sad to say nobody asked for data in that instance either and instead circlejerked about how women are not cut out for the startup lifestyle.
Sorry about the long rant, but I'll conclude by saying that it was these startling examples of misogyny and sexism over here that make me reluctant to comment any more. I actually want to delete my account but it turns out you need to e-mail PG for this and even then your comments won't be deleted. If I'd known about this when I signed up, I would never have made an account.