I'm not sure the ex-Googler would disagree with you on this, though. There's even a section titled 'Non-discriminatory ways to reduce the gender gap' that clearly indicates he at least is not opposed to reducing the gender gap.
Then we look at the industry as a whole and we discover placement is 90:10, that'd be indicative of a gap, and it'd be equitable to ensure that people who's interests lie in tech are not prevented from perusing it.
Would that be a fair and honest thing to do?
The easy answer to you question (which I think many would agree with) is yes. However, reality is a bit more complicated. Is the 75/25 split in the total population or Google applicants? Are differences originating from things under Google control or from other parts of society? etcetcetc. This is the conversation that should be had. To see differences and honestly discuss them (including striking down on unfair discrimination), while also discussing what the goal should be and what trade-offs we might want to make to get there.
But all of this is impossible when a significant and loud part of the population answer with calling people "sexist" and firing anyone who tries to broaden and nuance the conversation
There may be legitimate biological factors affecting career preference, but how do we determine when that stops and cultural suppression begins?
Failing that, attempt to experimentally manufacture a different culture in a small scale experiment.