I would say it's pretty clear that PG thinks there isn't any
more he can do. Lets not assume that he's doing absolutely nothing now.
I'll ask again: isn't it possible that he's right? There seems to be general consensus that girls do not get into computing science at a young age. So it makes sense there would be shortage of women with right ability at the right time for YC. There's nothing controversial about that. And short of inventing a time machine there isn't anything PG can do about that.
I know a lot of women in computing and almost none of them started as young as my male peers. These women code and some started their own companies. But they didn't do it in their late teens or early 20's because they hadn't even discovered it then.