The point of the economic numbers is that what's affordable from a Western perspective is not for a Japanese person. You're talking about a country where 50% of workers earn less than $25,000 per year! A $200k house in the US is generally considered very affordable. In Japan that's 8 years of salary for half the country, and easily a 20+ year mortgage.

Their housing prices are being further depressed by the fact that they're now dying off fast enough that even Tokyo's population is starting to significantly decline. And that, in turn, is further compounded by a prevalent superstition in Japan against living in a house where somebody died, which helps to further reduce demand for many housing units that 'become available.'

Seems like a baseless claim to me. Even just visually their zoning (or lack thereof) is obviously quite different.

When prices are high anyone who owns has incentive to prevent the supply problem from being fixed.