I believe it was Nick Land who described cities as “IQ shredders”; they attract high intelligence people from rural areas and then immediately tank their birth rate.
Yep, looks like it: https://news.ycombinator.com/item?id=24701129
The neoreactionary perspective is just oozing from that post, too.
Joke explainer: That was sarcastic, but the point is anyone can make up a plausible just so story about anything by picking some factoids to support their prejudices.
They almost certainly meant there is no difference rather than it being the true opposite.