China's density metrics are skewed by its humongous size, a massive chunk of which is sparsely populated desert.
Its coastal areas, where much of the population is concentrated, is extremely dense
Cities are dense, unlike American ones
I'm not aware of any city-local maglev trains. American cities are still spread out from one-another.
I think you are misunderstanding my point. The issue in America is that you tend to need a car to navigate within a city (metro area). Far less true in China.