There's a larger counter literature that has repeatedly debunked those claims since the 90s. Meta-analyses basically confirm it's mostly cherry picking, because there're issues with causation (violent kids like violent games) and issues conflating emotional arousal and violence (e.g. when studied long term kids chill out after 2hrs even if in the moment they're getting intense).
There may still be good reason to bar very young kids from it, much as we do with horror movies and such. Not making them violent so much as giving them nightmares, though. True for squeamish adults too, lol.