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.
Japan literally has rising fascist movements that want to bring back Imperial Japan, I think it's fair to say that they know what they're listening to.
I understand that Japan's youth displays a lot of Hitler and Nazi stuff. Not that they're Nazis or haters, they just think it's funny or something? Kinda like clueless American kids sporting Che Guevera shirts and posters?
Not really, it's also seen as a weird thing done by loners to them. One of the most famous animes in recent times, Overlord, features a WW2-based german character with manerisms and speech reminiscent of a SS officer. Every time they're on screen, the main character nearly dies of embarassment.