It's more complicated than that. In the Paris region, a lot of middle-class families that wanted apartments in the first ring in the 80s/90s often couldn't afford them (my parents tried to buy a 3bd 70m^2 and settled on a 4bd house double the size during that time), and houses in the second ring were really cheap in comparaison. That, plus the fact that trains to Paris weren't that bad/getting better led to a lot of people moving to the car suburbs.

As the parent comment mentioned, they're also the ones that didn't appreciate in the 2010s (after crazy appreciation in the 90s/00s): https://www.meilleursagents.com/prix-immobilier/ile-de-franc...