I didn't really say what my perspective is on whether the suburbs are good or bad or cars are good or bad. I think there are plenty of reasonable arguments as to whether they are or not. What I am dubious about is that they are somehow the source of some hand-wavy "widespread" mental health issue in America.
I wouldn't be surprised if it contributed significantly because of the lack of (access to) third places [0] it breeds, but that is conjecture on my part, so fair enough.
[0] https://en.wikipedia.org/wiki/Third_place