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And like many adults who claim to experience impressive leaps in ELO, claiming that adults can do it (and without insane numbers of hours like many of us put in), you have been banned for cheating.
This is exactly why I say show me your FIDE or USCF rating climb or shut up.
Wow. Did you necro a two year old thread just to put someone who doesn't have an account any more in their place? How are you even finding these threads?
I also don't think there's any way for you to know whether he was banned for cheating just because his account is disabled. It's been a long time and he didn't seem to enjoy chess a lot, maybe he just quit and deleted it?