You might want to look up how the US Census Bureau defines urban. My 7,000 person town with orchards and farms is considered an urban area. This makes some sense as it's loosely part of a greater metropolitan area but it's not remotely an area that could be served to a significant degree by public transportation.

17% of Americans is not an "edge case" by any stretch of the imagination. That's 57 million people.

OK? You ignore the larger point by disagreeing with the terminology I chose. Reducing car usage in the US by 70% would be an absolutely massive win

And Musk sending employees back to the office is the opposite of reducing single occupancy vehicle use.

Not to mention the fact that a large part of those 83% would like to be able to occasionally travel outside the urban area.

There are also planes and trains, and, if you're travelling to a remote location without access to either of those, rental cars. But most people in an urban area are primarily travelling within that urban area.