Distinction is suburban vs urban isolation. Making family residencial space more comfy =/= retreating to single family unit outside urban areas op described. Many east asians still try to knit together multigenerational arrangements if they can afford it, i.e. having extended families live in units of same apartment complexes. I mean granted you can do that in suburbs too, but objection with ops claim is people with money don't default to big private spaces in burbs... especially in dense countries with urban areas where it's PIA to get into city. In which case it's better to stay in city but get nicer spaces. Those with resources will coordinate so family is close. It's not communal housing arrangement but it facilitates communal child rearing. Of course if you have absolute fuck off amount of money you buy a penthouse or mansion depending on lifestyle preference and pay someone else to raise the kids.

Of course wealthy people, whether they're Korean or American, buy and live in bigger houses. No surprises there. But that's a pretty weak argument to support my parent comment, which reads less like "people love big houses" and more like an anti-urban-density pro-SUV rant.