I don't believe it. People are leaving Detroit, not because anybody is trying to prevent them from coming. For that matter, Upstate NY is not particularly NIMBY but it does rain. On the other hand, people still want to seem to go to California but it's only a realistic plan if you're comfortable being unhoused.
One of my theories is that people in Arizona hate the government and New Yorkers don't because in New York you can drill a well and take care of yourself but in Arizona you have to plug into a tightly regulated network and live where they tell you you can live and how they tell you to live.