I got that info from a guy who personally planned one of these "suburbs", I spoke to him in person.

That would be because a lot of the "progressive" urban planners, if they were let off the chain to do whatever they wanted without question, there would be no cars, period, in their perfect cities. Only walking, bicycles, and public transit.

Its why I always say that every city I have ever built in something like Cities: Skyline would give them an aneurism. I have efficient mass transit, but I also have efficient road networks. I have well developed downtowns, but I also have well developed suburbs. I have office parks for highly educated workers, but I also maintain extensive industrial parks (including heavy industry like Ore Smelting and Oil Refining). I have legalized narcotics use and and well funded educational services, but I also have a well funded police force with a "tough on crime" stance regarding prisons. I also have a personal thing where I will build a Liberal Arts college, a city district with zero-emission housing and organic shops, and ban all non-electric vehicles, but I deliberately name the district the "Hippie Ghetto."