https://www.youtube.com/watch?v=NV2yvI4Id9Q
... in which he says that high-powered careers are very unpleasant due to hyper-competition among people who are exceptionally willing to tilt their work-life balance way toward work, and that most (but not all) of such people are men. Which doesn't sound like that unusual a claim, really: it's a fairly mainstream belief that women average more family-focused than men, and you only need a small difference in means between populations to get a big difference in representation at the far tails of a trait's probability distribution. (I would have preferred that he make the point with less bluster and more graphs, but that's just a matter of taste.)
Is that what you were alluding to, or does he somewhere else contradict this to make the crazy and very different claim that "only men have high enough motivation to be successful in competitive industries"?