That's interesting, they're pretty much the same techniques used by racists from the 17-1900s to determine "racial superiority". It's like it never went away, just crawled into 4chan
Racist phrenology is alive and well among the racists who hang out on 4chan, and definitely, they also apply it to incel theory, mixed with misogyny and a feeling that genetics and society dealt them an unfair and poor hand which can’t be rectified.
It's less that there's a thread of racial superiority that has been continuously passed on, and more than there is a human bias towards rationalizing away complex issues