The decision to hire someone in a high-skilled job has extraordinarily little to do with their compensation and much more to do with their perceived value. Society has conditioned us to view a certain kind of masculinity as inherent value. Men are rewarded for their aggression and confidence, whereas women are criticized for ego and emotionality.
Perhaps this argument has credence in the low-skilled labor market, but it is not applicable to tech, where compensation packages are routinely so large and supported by large VC funds that those of us who do hire can see those salary differences as negligible. And, even if I were sensitive to those differences, I would not hesitate to pay 30-50k in order to get the right person for the role.
The question here is: are we doing a good job of finding the right person for the role? That is why the Google women are demanding "opportunity equity." Because the system I just described above is prone to failure thanks to unconscious bias.