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
“Which is at minimum a debatable proposition”
Yes, I’m not sure those groups (one quite large, the other rather small) were different enough that differences in mortality can’t be explained by circumstances (food, shelter, etc.) rather than genetics.
I’m not sure about that for any group in historical memory actually.