I’m well aware of the risks. But I think you have an unrealistically rosy picture of professionals’ diagnoses.
Especially using TikTok to try and improve mental health issues seems a bit like trying to fight fire with a (edit: spelling) hose of jet fuel.
I imagine it will rely a lot on the pilot, and how well they understand those limitations. Perhaps the bigger risks are those without good understanding of LLMs who just treat it like an all knowing expert human.