Individually? Possible, totally. In aggregate? It's not a secret that Japan has an uncomfortably large fascist subculture. Putting 2 and 2 together as an aggregate makes sense.

Of course, I wouldn't go up and assume a random Japanese person listening to fascist northern European metal is necessarily a fascist, but if they also had the rising sun flag of Imperial Japan on their car, or hanging in their room? Absolutely.