I have no idea how he isn't ADHD. Add in the rocking back and forth, the maddening attempts to schedule his shit, him losing his temper when things don't go his way, an inability to pay attention, a lack of spatial awareness, the non-stop talking about random shit, the drinking, the never cleaning up his house, the never trying anything new, impulsively saying/doing things without thinking, the need for instant gratification, the inability to adhere to rules, difficulty taking turns (no multiplayer), inability to hold down a job, and a big inability to manage personal finances, making promises and never keeping them (Patreon goals)
It's not because he's too stupid to improve things, he just has no control over what he can pay attention to. He's obviously developed some coping skills but has never clearly figured out what makes himself tick.
The perfect, perfect example is his prestream length. He has no fucking control over it.
Maybe its purely an environmental thing when someone isolates themselves so much and for so long, but he clearly has issues with all of these things.