I'm glad it that he doesn't go into depth about the core and controversial statement re: why 13 year old girls don't flock to programming in the way that nerdy 13 year old boys do.

I'm also glad YC is being proactive here. It's always clear that certain biases exist, and the only way to overcome them is by addressing them specifically. Deep cognitive biases (against young people for example) can only be overcome by amazing success stories.