Yeah, lots of correct observations, but also lots of wrong conclusions. I'd even argue the very first point about culture is very relevant, because japanese culture inherently puts a small bit of breaks on the aspects of capitalism that spiral out of control (they have tons of hypercapitalist issues too, though).

I think it's correct that having private companies compete has certain advantages in railway infrastructure, if the right framework is given. Imagine someone from here was to start a railway company - they would know about induced demand, about the importance of having frequent service even at times of lower demand to enable rail as primary transport. They wouldn't have to convince rightoids that spending public money on that is worth it, they could just do it and see the results. In general the good thing about markets is that they enable less planning overhead as everyone focuses on their own thing. Loosely some sort of swarm intelligence.

But none of that will ever work when cars are effectively subsidized and even private rail companies would still be beholden to massive political hurdles for building new lines. Though especially the latter is a real question about tradeoffs of benefit for society vs. individual preference with no single correct answer.