Which is kind of irrelevant, as none of that translates to the US. Housing isn't a depreciating asset because generally we don't built stuff so cheaply that they are worthless within a few decades. Add in the imminent population decline and that solves pretty much all your problems right there. Probably also undervalued in that video? The fact that they've got such good rail, making much further-flung outskirts easily accessible. Getting a 15 minute train ride to the heart of the city is pretty great by American standards.
The fact that you think none of the ideas in Japan is relevant to the US is exactly why we're in our predicament. The population of Tokyo, as already been said, has been increasing steadily increasing. In fact, it's increasing by over a million people compared to NYC's half a million since 2000. (approximate numbers here which don't include the entire metro area).
You also realize why our inner ring suburbs are suburban ghettos now? We've build stuff that was only meant to last a few decades post WWII. And since we haven't allowed for upzoning of land and other factors, they're still stuck as single family neighborhoods when they could have been improved upon due to their proximity to city centers.