That’s not true. Public transit in Tokyo is slower than driving in Dallas or LA. Average one-way commute in LA is just over 30 minutes: https://fred.stlouisfed.org/series/B080ACS006037. For Tokyo it’s 45-60 minutes based on sources I’ve seen online.
As I said on https://news.ycombinator.com/item?id=46214609 , that statistic doesn't mean what you think it does. The article I linked doesn't have figures for Tokyo but it has Shanghai which is comparable; there are around 4x as many jobs within 30 minutes by transit in Shanghai as by car in LA, while the population is only 1.5x bigger.