That makes sense, thanks for explaining it. Although you are right why would it not have occurred on the continent. But is that really “evolution”?
I guess that depends on your definitions.
It’s certainly differential survival of groups, but that might not result in real evolution unless those groups were significantly different from each other to begin with.
As I said, I’m a little vague on the details of the idea, but it seems to be based on the notion that the English upper classes of 1300 were genetically more competent than the lower classes. Which is at minimum a debatable proposition
The article seemed to be implying a divergence of genetic profiles between upper and lower classes, which I don't think makes sense.