It’s a trash “study” he did. Here it is. Analyze it. It’s garbage, doesn’t prove what it sets out to, has no flow, and changes from “physics never discriminated” into “women choose not to be in physics” to “women are bad at physics” to “men are being oppressed by women”.
Read it. It’s garbage.
Or better: Do what I did. I thought it would have insight and got more and more disappointed as I went through.
A theoretical physicist friend shared it days ago, before the “big news” broke. He’s a bit sexist himself but he was offended by this: not so much by what it was trying to suggest but how it utterly failed at its attempt and makes all physicists look stupid by proxy.