You're assuming women aren't currently at a disadvantage in that selection process. Which, evidence indicates they are. So...leveling the playing field is not disadvantaging others at the expense of women. It is recognizing that our current culture has biases that need to be corrected for.
Your argument is essentially that there are almost no women talented enough to be in leadership roles in tech, if they were chosen fairly; because that's the situation we are currently in. I'm not suggesting quotas here, and I don't think Pike is either, but there's clearly a bunch of broken segments in the path to advancement for women in tech. We're chasing off talented people because they're women (and minorities), whether we mean to or not. Acknowledging that deficit (on our part, as members of the tech community who aren't subject to those biases) is not unfair or a zero sum game.