Why was 'iamnotback' banned in the first place? He has been a significant contributor on this forum for many years, highly respected for his analysis, and he has educated many forum users on a wide range of topics. He deserved more respect, looks like you banned a significant and important 'voice' in the crypto space just because what he says and does annoyed you ... that's weak & cowardly.
According to other mods who dealt with his antics (I've merely reported one of his alts), he's been banned multiple times under numerous other accounts for trolling (which ended up with him finally getting a permaban and thus him ban evading to circumvent that). He has shown a complete disregard to the forum's rules to such a degree that I don't think any sort of reputation is going to help him.
So the underlying reason for ban is trolling. It's such a convenient rule that can be applied basically to every user here. Still there are thousands of users who are not banned.
What I have noticed is that he doesn't have patience for Dunning Krugers, so if he lets you (the general you) have it (and as he often does, quite bluntly so) perhaps instead of getting offended and taking the easy way out by labeling it as trolling you might consider evaluating your own knowledge about the subject and perhaps getting wiser by the process.
That would require people eating the humble pie though and knowing the human nature that won't happen so we are where we are. You can't force people to accept what they want to deny. We'll just have to wait and see how the things will play out eventually.