I really doubt this. A lot of men are totally unaware of how women are treated, which fellow men on their team are harassers, or don't believe women when they report harassment. My evidence for this is every man in tech reacting with shock to this story, and every woman I know saying "yep, I have a story like this," or "I know many women with stories like this"
The behavior discussed in her story includes stuff that's not sexual harassment, though. A sizable chunk of it is about poisonous office politics, something pretty much everyone would be aware of and which most people dislike. So it's not hard to believe people with better options would leave, regardless of gender, leaving people who either like that sort of politics (some do) or don't have better options.