Most of the relatively recent net inflow into certain cities is from a fairly specific young college-educated demographic. And the reality in places like Manhattan is even though a lot of those sorts of folks moved to the "big city" for jobs after graduation, in practice, many of them moved to the suburbs when they got married, had kids, etc.
After graduation I probably knew dozens of people who moved to Manhattan or nearby. I'm not sure more than one couple I know is still there.
I notice that very few people that work in Manhattan actually live in Manhattan. Unless you're very young and happy to live with roommates, or are already loaded, or are making big bucks from a, say, high finance or FAANG SWE job, most people seem to be commuting in from NJ or the outer boroughs (Brooklyn and LIC are probably priced out too).
After graduation I probably knew dozens of people who moved to Manhattan or nearby. I'm not sure more than one couple I know is still there.