Let's sum up:

1.  Women arrive at university less interested in philosophy than men, and that doesn't change as time goes on–indeed, it fairly closely tracks their representation among PhD graduates.

2.  The pseudo-science of "implicit bias" and "stereotype threat" (see also) do not appear to explain anything about the underrepresentation of women.  Indeed, it turns out that philosophers like Sally Haslanger and Jennifer Saul have regularly misrepresented the research.

3.  Women report, credibly, absurd amounts of sexual harassment and other unpleasant and demeaning treatment based on gender in both graduate school and after, behavior that is unprofessional and an unfair burden for women wishing to pursue philosophy to have to endure.  Regardless of its causal role in the underrepresentation of women in the profession (it's hard to see how it could not play some role!), the culture of tolerance for sexual harassment in philosophy has been disgraceful, but now seems to be ending.   This is long overdue, but it's a shame it has been accompanied at times by open contempt for fair process.