Wrong again. If anything they have an advantage over the coyotes because they were familiar with the urban environment from the get go. The coyotes had to learn and learn fast before they were turned into flat fauna.
Almost all evolution is determined by the environment. That's why you see virtually no evolutionary activity near the equator and the poles because the environment stays the same. Evolutionary processes happen in the temperate zones where climate variability is the most pronounced and thus stress is introduced into the populations.
As I said, this is nothing new and is well documented in many places.
Without genome changing, with all same genes, can the biology of a living thing be different in different environment or not? The main question is this. Because we know the genetic changes take long time. So for human biology to work different in 1000 years, the human genes should be able to act differently in different environment, especially social environment.
And the answer to this question is; yes it can. We know for a fact that living things can express a whole a lot different biological process with the same genome available to it in different environment. One gene will act whole a lot different in a different environment. This will cause the organism to change in behaviour and appearance in a rapid way. This is cause the gene is acting differently creates a whole a lot different biology in that living organism. This is called epigenetics.
If you agree with this fine. If not still fine by me. I could not care less.
So back the main idea, 1000 years ago people were much different from us (biologically). Therefore comparing holocaust that you can speak survivors of, to some stories from an age even people back then were biologically different from us if a thinking that is missing logic in it. The person in this act should look for help.