This seems to be a bit mixed in reporting.

Seems like it depends on what the outlet wants to spin.

One article cited the trademark for recorded music and merchandise in 2022, but vaguely said there was a separate trademark for performance, but that was left unspecified. That article seemed to want to induce a narrative of opportunistic trademark, but even then that's perhaps a bit of a stretch as they wouldn't have known it would have gone down as a media sensation that soon, though it had been announced as a thing.

However, another article explained that the performance trademark was registered in 2014. That is pretty unambiguously way before Netflix would have even had it as a thought.

Their case is shit, its frankly a miracle they were even able to trademark “Demon Hunters” because it’s so generic. I see this going nowhere.

How many band names would not be considered generic independent of context? The Cure is trademarked, R.E.M. is trademarked, Queen is trademarked... Famously Apple computers ran up against Apple records trademark and it was deemed both ok for Apple Computer to continue without declaring it genericized, just that they were trademark in their respective markets. Until iTunes, then Apple had to change the arrangement.