Walks like a duck, quacks like a duck. Shits like a duck, it’s prolly a duck.
Well, that's kind of the problem. As much as I want to believe it, it just doesn't really fit. The things written to the casings… well I'm sorry, the only people I know writing "OwO what's this" or "catch this fascist" are very left-wing.
Sure, it may be possible that they also ironically made fun of such things, but it's definitely not the intuitive thought
So the only thing that actually would lead to that is his "internet activity" and yeah, that's what the original person asked. What activity is known that really shows he was far-right.