First off, reversing/not reversing a chat restriction has nothing to do with your race, or anyone's race. The system doesn't know your race, and nor does Riot unless you specifically tell them for some reason.
Secondly, Riot Support does appear to have some discretion in giving second chances after a permanent ban, and we're not clear on when they can. Based on my personal observations, it seems to happen under the following situations (barring improper bans, which are reversed as a normal procedure):
- A player's behavior showed significant improvement.
- The player was polite, respectful, and understanding of why they were punished.
- The player demonstrated commitment to reforming.
- The player understood that being unbanned was not a right, not anything but a long shot.
- The behavior that earned a ban was only just over the edge, or had significant extenuating circumstances.
Now, those are all guesses from the few times I've seen this happen, so don't take them as fact. The long and short of it is that Riot does not owe anyone an unban, and it is a discretionary exception to normal policy, not something that everyone gets just because one person got it.