Which public transport? Tokyo Metro is publicly-owned. Some of the JR branches are still publicly-owned. JR was only privatized in the late 80s as an anti-labor move and to deflect from the unpopularity of closing unprofitable rural lines. But of course the government built most of the network, including the first shinkansen lines.
It sounds like they’re praising it in Japan and saying “of course it could never work here, Americans are just genetically predisposed to cars”.