Indeed, your conclusion is obvious if you talk to anyone about their living choices or apply the slightest amount of common sense

Lyman Stone, who is screenshotted in this post, attempts to address this [1]. His conclusion is that migration is not sufficient to explain the effect, but I have not looked in detail. In the past I have found his explanations compelling but I can't vouch for this one.

[1] https://twitter.com/lymanstoneky/status/1775154652452999259

I believe that means you're in agreement with the author. The point of the tweet is to counter a claim that low fertility in cities is caused by high prices; if large families leave cities for extra space then they're not doing so because of price.

> I have written frequently about the relationship between high housing density* and low fertility. The most common counter argument is that the real problem is urban prices.