I found Lcy on IRC. We chatted.
Turns out he went under a different name and yes, was at the New Years eve party. The ban list must have cleared by accident. He apologized for everything, and understood my perspective on the event.
Lcy unbanned me, and plans to unbann the others who had got caught up in Isar drama. He changed his server to "I'M NOT REAL" and admitted to the players that he was a fan.
Lcy now looks forward to becoming his own person and making his own projects, under his own username.
Hopefully he'll stick to his word. But he claims he is embarrassed, and is hoping for a new start.