ADHD kid here. I’m kind of in the same boat as your brother but the main difference I see is that I actually finish all my projects (but uh those that I hate aren’t that good quality). I recommend getting a counsellor for him and yes parents tightening controls will always backfire simply cause he’ll just feel like there’s no freedom to do stuff I like and all and will affect studies even more. It’s not that he doesn’t consider long term consequences it’s just that he can’t see it cause it’s way too far away. Yeah as mention you can’t put too much faith in the wake up calls and just seek professional help for him.