A little bit of necro-threading, I realize: but I've been away for a while, so I figure I get a pass. I'm rejuving the thread. Hurr.
I just have to say that Judge Dredd definitely already had a rejuve job in prog 702, with that
beautiful art by Steve Dillon.
Perhaps not the same kind of rejuve job that he had later, but definitely a rejuve job. "This is no simple rejuve job" indicates that it's a more complex rejuve job. The fact that he's getting out of the "dermagraf" machine doesn't preclude a more complex procedure than skin-grafting: it only implies what that one machine is doing as part of a larger process.
Of course I'm making assumptions about the writer's intention: but I've always known in my head and in my heart that Judge Dredd got rejuved after Necropolis.