-ish. I don’t believe SDG has any trademarks at all. However, Nelson could still very easily send a Cease and Desist and they’d most likely have to follow it.
Personally, I wouldn’t be surprised if Nelson is going out to meet people in person about merchandise as the “unannounced Unturned project,” but otherwise I don’t think Nelson will shut it down.
Some YouTubers still could though (EDIT: the parts using their likeness) if they wanted, as their personalities are used for some of the shirts. BattlEye technically could too, I guess?