OP, you had plagiarism case. Many accounts were banned and many were receiving signature ban. But 4 years should be enough for salvation however honestly, I do not see you have a chance. You should accept it.
I don't remember the drama surrounding this member (not surprising since it was so long ago), but from what I've read here it looks like plagiarism might be only one rule that he broke, with the other major one being ban evasion. Can "salvation" be earned in four years? Certainly. Do I think OP has done anything to suggest that he's going to be any more honest than he was when he got permabanned? Nope.
I also question why he wants to return to bitcointalk now, with that specific account (I'm pretty sure he has others, likely still active). He's probably got plans to put it to use in some way, and my guess is that whatever he's got in mind will either lead to shitposts or some variety of shady activity. Not that the ban appeal process is a democratic one, but my vote is to let it stand as is.