A woman has never rippled to the top of the chess ratings nor become world champion. Chess is a more pure meritocracy than music because all you have to do is win, there is no peer assessment. Style does not matter. I understand that women can be as good as men at chess. There are just not enough women playing. So the odds of one becoming the best are stacked against them. In a similar way people born in Oxford are not likely to become the world champion. There will be a gender pay gap (and also an Oxford pay gap) because only the very best chess players get paid.
Tech is the same. A typical tech interviewee will not be very good, this applies regardless of gender or ethnic grouping. If we had tech numerical parity then women would compete equally.