Not sure if it's a TFM thing that caused this but he shouldn't have been on the server knowing his appeal wasn't processed.
To be fair many times I’ve joined the server when I saw my ban was lifted on the server without even checking the forums because I just assumed the ban appeal was approved.
I don’t think uvb should be held responsible for an error in the longban list. He saw he was unbanned and so joined the server.
His appeal wasn't approved, so he shouldn't of continued to play upon realizing his appeal wasn't approved or should of at least asked someone for confirmation that his ban was lifted if he was unsure. I lift the bans after the appeal is approved to prevent such incidents from happening, but yes it wasn't entirely his fault but still, he should have at least checked his appeal before continuing to play.