It is possible for a trait that is broadly negative in most environments to confer enough of an advantage in a specific environment to be selected for: see sick

It is possible for a trait that is broadly negative in most environments to confer enough of an advantage in a specific environment to be selected for: see sickle-cell anemia. And there are scenarios where people with ADHD outperform thise without (the famous "gorilla video" tends not to fool them, for example). But I agree this is basically only hinting at a possible hypothesis, nowhere near an actual conclusion.