Why are people so outraged at this guy? I read what he wrote and it honestly sounds like he's trying to be helpful. It's at least polite. The knee-jerk "SEXIST!" reactions to him come off extremely self-righteous and immature. There are a hundred other male-dominated careers and I never, ever hear women complain about not being equally represented in them. Why? Because they're not attractive careers.
It's obvious why people are angry - he's trying to find a biological justification to exclude a class of people from a high-status career.
That's something that has mostly been dismissed as quackery, and has been shown to have some pretty negative consequences throughout history.
The onus of people who want to stick up for this guy is surely to find evidence to support his proposition, rather than go after people mad at the content of the post itself?