How in the world does that happen?
First, I forgot to escalate his previous IP ban to permanent when he first ban dodged. I fully accept blame for that.
Then when he made another new account to ban dodge on the old IP, and that got banned, I assume the new ban was an IP ban and not just an account ban. Which was how he was able to get back again.
Now, thanks to Sigma and Kradorex, he is
permanently permanently banned.