I recently saw this

Is it possible that someone registered an account years ago?

No. The user date was changed. There are a few accounts with changed user dates in Toribash. There's a 1982 one if memory serves.

Either a hacker, or he paid a shitload to get it...

Toribash was released at: March 2, 2006

So, can't be registered before that^

Do people really pay for date changes?

You're all stupid
Yes you pay a shit load for a join date change
But dead_rabbit is an RB alt for the Deadly games event deal
Pretty sure the join date has something to do with the event

The account is being used for an event, somebody with the power to change join dates changed it for the event.

Sir is an admin. That explains