Nope for a short time while being afk with kill aura on was not bannable because of a hack which made players appear as if they were using kill aura when they were not.
At least you were a man and apologised for your mistakes. It takes a lot of courage to come clean like this. Doesn't matter if they don't forgive you but you did the right thing .
well gl with being forgiven, ive never interacted with you or ever seen you in game so idk what you really did.
If you're serious about trying to refund every one you have scammed, that is very kind of you. It's lovely that you acknowledge your mistakes and I hope you continue to display a positive attitude and behaviour.