Comment by vladvasiliu

I don't have numbers, but I doubt that 12.3% of people living in Paris proper (the 20 arrondissements) live in detached houses. Yes, there are villas in the city, but they're extremely rare. I don't see them housing more than 1 in 10 people.

So their numbers seem indeed dubious.

Edit: I found official stats (French only): https://www.insee.fr/fr/statistiques/2011101?geo=DEP-75#chif... Table "LOG T2". "maisons" = "house", "appartements" = "apartments"

In 2019, less than 1% of housing stock were "houses".