I'm familiar with Japan and find it quite believable.
You may be familiar with the "akiya" phenomenon, where empty houses in the Japanese countryside are sold for a song. The same applies not just to residential homes, but to other buildings as well, and their price tag is very low for the same reason: the property has serious issues and/or has been vacant for years, and will require far more than the initial investment to make habitable.
Here's a fascinating blog post by someone who went poking around the ruins of one hot spring town (Kinugawa) that went through a particularly dramatic boom and bust cycle: https://spikejapan.wordpress.com/2010/06/14/983/
This particular hotel at least appears to have been open until fairly recently, but Google reviews describe the "Showa-era" furnishings (read: 1980s at best), and it's on the fairly grim slate grey Kujukurihama beach 3.5 hours from Tokyo by train: https://maps.app.goo.gl/G53KWyCsmeUy8JyR9
This really is a great blogpost, I'm really glad you shared it.
Yeesh - interesting blog post, but terribly sophomoric prose, distracting and clumsy. The author is at least 40 and should know better.
We are not taking about akiya here but actual businesses. A thriving business would never sell for one million yen.
Re the spikejapan blog: The author’s About page includes this line which describes my experience of the article very accurately, having bailed after a couple of minutes:
“It's a species of anti-blog, as there is no way that you'll get through a post if you suffer from any kind of attention-deficit disorder; even then, you may need a strong cup of coffee and an hour to kill.”