Men are just as likely to feel like frauds, to downplay or disbelieve their own achievements, to suffer from irrational low self-esteem.

Sorry to be a bitch about this. But you keep saying this, and I'd really like a citation that actually says this. Even the Science article, while saying it's not just a women's thing, both fails to cite a source, and mostly in fact talks about women.

Even "equal numbers" is vague. Equal numbers of men, given that there are more men than women in academia/"successful" careers, implying a lower rate among men? Or at equal rates?