It's a good point about not taking the bait of debating with the far right about their nonsense, but I'm not convinced it quite counts as trolling when, being a proud Nazi, you get up in front of a bunch of Nazis and do Nazi salute to show them you are a Nazi. I guess the trolling is what he did afterwards.
Yeah, it's never been as a troll, but as a sign of solidarity and beacon for others. Continuing to treat this like a trolling is continuing to give cover for Nazi/fascist behavior happening more and more in the light of day.
The Alt Right Pipeline depends on edgy immature people ironically saying edgy stuff for dopamine hits until they are effectively trained to repeat the edgy stuff unironically.
When they put away the dog whistles and just come out as evil fascists then it causes a lot of their supporters to have a "are we the baddies?" moment