Without having a debate about whether he has one or not, I’d ask a different question: Does it matter?
Suppose he does: It should be diagnosed at this point. He’s been a professional athlete with the resources to have received a diagnosis and treatment for 9 years now. NBA teams for several years have made mental health a component of their player health programs, as have agents and the Player’s Association.
The stories of Kyrie’s “idiosyncrasies” have been around for several years now. If the underlying cause of these is a psychological disorder, do people believe he has shown any signs of treatment, such as more mild/infrequent idiosyncrasies? If there is a disorder, should he have some responsibility for seeking and following treatment, given that resources are not an issue for him, in the same way he is responsible for maintaining his physical readiness to the best of his ability? I would argue that he does bear responsibility, and would also suggest that, if anything, his behavior has deteriorated over time, implying that if this behavior does have a mental health or psychological health component, he has not been living up to this responsibility of seeking treatment.
Compare it to another player on the Celtics — Marcus Smart. It would not be remotely surprising for me to learn that he has a diagnosed mental/psychological health issue. Running into the stands when he was in college, breaking his hand in the hotel, and several of the other well-documented outbursts he’s had point to something. At the same time, the outbursts seem to be decreasing in both severity and frequency, implying that, if there is an underlying cause, he has been successfully receiving some treatment.
A euphemism that’s common to me for mental health issues is that one is “working through some things.” My point is that while I am agnostic as to whether or not Kyrie has a specific problem, I think I can comfortably say that he is not “working through” anything. And that’s on him, regardless.