I imagine for the younger folks on HN, we grew up with what seemed like >50% of people claiming to have ADHD, OCD, Tourettes - or some other TikTok-fad "cool" disorder - which obviously not that many people actually have these problems.
At least not too long ago when I was young enough to be in that crowd - ADHD was the king of "cool" disorders. Everyone wanted to have ADHD. If you were "normal" - that was "uncool". It was like - what's wrong with you? Why don't you have some debilitating problem like everyone else?
So like claimed gluten intolerance in the adult population - I think there could be some skepticism to the occurrence and severity of some of these disorders - and to anyone making products for such groups to be a snake-oil salesman trying to capitalize.
But, who cares? Is anyone getting hurt? Let people do what makes them happy.