That distribution is actually normal, considering how many more men play chess than women. But I haven't heard a good explanation on why so few women play chess in the first place (other than the two reasons I suggested).
The father of the 3 Polgar sisters deliberately pushed them to play chess to prove a point. All 3 got very good, Judith was #10 in the world. This strongly suggests "not interested" is more true of other women than "not that good."
Actually it's a 3 in one example, and the strongest of the 3 players is the strongest woman chess player ever. So I guess that yes, I think it's pretty strong evidence, and no, I don't hold this opinion particularly strongly; I don't really give a shit which group is better at what but it's always fun to watch people foaming at their mouths trying to prove how similar or different groups are when it's obviously false.