Yeah, I couldn't find an account named "Therealinkdemon." Leave "Therealinkdemon" on the banned list just in case, but add any of their known aliases (such as TMKirby).
Fun fact: Imgflip knows when someone changes their username. So if "Therealinkdemon" is on the ban list, and he changes his username to "TMKirby", it still falls under that IP, and is still banned.
That's actually really helpful. IP tracking is very very *very* wrong when used incorrectly (such as stalking), but when used correctly, it can be one of the most useful things to people like us.