1) the "pool of potential startup founders" is programmers,
2) it's non-discriminatory and self-selecting, and
3) women are underrepresented in this pool because it's hard to get 13 year old girls interested in programming, and
4) rather than encouraging women to become startup founders it would be better to fix that 13 year old girl problem
This debate about whether he was referring to "just programmers" is a complete red herring. Programmers == startup founders, to him.
The really damning quote is this:
If someone was going to be really good at programming they would have found it own their own. Then if you go look at the bios of successful founders this is invariably the case, they were all hacking on computers at age 13. What that means is the problem is 10 years upstream of us. If we really wanted to fix this problem, what we would have to do is not encourage women to start startups now.
Repeat: pg literally said it would be better to discourage women from starting startups now.
Not "these" women. Not "non programmer" women. All women.
......
The problem is not that pg is some huge sexist. It's that he's defensive. He's passing the buck 10 years up the chain, saying that's where the problem lies. In CS curriculum or something.
But in actuality, parents and educators could just as well say that 13 year old girls don't have enough 23 year old female hacker role models to look up to.
So perhaps YC, PyCon and the industry as a whole could be more proactive. For example by spotlighting and giving extra support to the best examples of female hacker role models, and connecting them with girls.
Not by discouraging women from starting startups now.