This goes back a long time. The stockbroker belt/home counties as where commuters into London live has been a thing for more than a century, since railways then automobiles made this practical.
The attitude klabb3 mentioned of "Europeans don't want American suburbs" is, as I think he is realizing, nonsense. No matter where, no matter who, the majority of people prefer detached homes with lawns if they can afford them. (I speak as among the minority who prefers dense living.)
Eh. Yes, people want ponies. Suburbia does indeed optimize for this parameter, but they sacrifice almost every other. Single family houses with lawns is nothing new in Europe, but most of them are rural.
I'd still defend that for the vast majority of Europeans the attraction of American suburbia is very low. Most choose to live in apartments in dense cities that are most attractive near the center. "Walkable" is a term i first heard in the US, that is quite meaningless in Europe, for a reason.