One angle I don't see often see mentioned: if you look carefully, you'll note that many of the buildings, furnishings, signs etc look a lot older than 2011. This is largely because Fukushima (and almost all of rural Japan along with it) has been severely depressed economically ever since the Bubble burst around 1989, so what you're seeing dates mostly back to the 1980s.

For comparison, here's a trip report from hot spring resort a few hours of north of Tokyo that looks almost as apocalyptic, but has been ravaged by nothing other than economics.

https://spikejapan.wordpress.com/ugly-japan-2/