Good on them for stating it upfront though. (The mention of “alt-right” indicates a more recent version?).
Back in the 90’s/early 00’s it definitely attracted people both left and right winged.
However from my personal experience right wingers was more prevalent in wargaming compared to rpg’s. (Which really sucked because there you were enjoying a nice back n forth about Warhammer and then out comes the racist nazi talk…)
Games Workshop did good by making a pretty strong statement a while ago. But I’m afraid it’ll always be a thing.