Let's boil that away even more: suppose that the population entering CS is representative of the total population. Then, let's suppose that the social barriers to graduation & the professional workforce are adequately high that it filters out women who are not exceptionally determined to succeed in this environment[1].

When I've talked with women about this, they generally seem to agree with that.

[1] Some women get death threats over their analysis of sexism in video games. I can't think of a more hostile environment.