Some Asian countries also have a weird thing for Hitler.

https://www.lowyinstitute.org/the-interpreter/southeast-asia-s-weird-fascination-hitler

In many ways yes. Japan has its own brand of racial superiority which is why I just found it a bit weird they're going for nazi shit. It could also just be that they heard and liked a song, but I kinda doubt that this is the case.

Japan is conservative in the sense that anyone that isn't Japanese can go get fucked. How many Japanese neo-nazis are also multilingual to understand the lyrics? This seems less like nazis in Japan and just people who found music they didn't hate.