Adding on to 'High Noon Village', iirc the B2 White Queen had saved a bunch of her subjects and put them on a ship, they dropped her off in the desert so she could carry on alone. So technically all of those carapacians would have also been exiles even if they didn't command any of the canon players. Furthermore, Homestuck canon constantly alludes to other doomed sessions with other players happening... who's to say one of those nameless carapacians wasn't the exile for the Gent of Piss?

Well, on Earth that may be True, but on Alternia the Beta Trolls were the only ones to play SBURB. That being said? Yeah, that’s just all ‘exiles’ are, literally the Exiled people of the Kingdoms. In the Beta Kid Session there was brutal planet-maiming and moon-destroying, it’s very likely that in the Troll Sessions every Carapacian in Prospit and a chunk of the survivors in the Battlefield would get Exiled.