From my reading of the article (which is hard to parse not being an expert) it seems there is a German YouTuber with Tourette's who also on his YouTube shows displays non-tourette's tics. And these tics are being copied by other young people watching his shows, and being presented as Tourette's until they arrive at the clinic where these experts go "hang on this kid does not have Tourette's but does have tics similar…
It's plausible [1] [2]. I am by all accounts neurotypical (except perhaps for a touch of Aspergers) but I have an involuntary tic. Every now and then (like once or twice a week) a memory of some incredibly stupid thing that I once did -- sometimes decades ago -- will pop into my head and before I can re-establish conscious control I'll make a vocalization that sounds like a cross between a whimper and a sneeze. It's…
I've also wondered if my ADHD somehow factors into it, but that I don't know.