I'm sorry to say that your appeal has been denied.
I will also state that no rules have been changed.
I was wrong as I had forgotten about that rule change. But looking back at the situation, this doesn't apply to the rule as the attack wasn't a constant attack, but was a single hit from as a reaction to being surprised.
Just a new server has been opened with a different rule set to allow for open pvp.
A rule change doesn't always mean that past punishments for the rule are now void. Especially in your case. Since were at the time previously unbanned from a permanent ban. And were told that if you were to break the rules again your permanent ban would be reinstated.