They're still an American citizen. Nowhere in the article is it mentioned if they voted in the U.S. election.
If they didn't vote, then I'm sorry to say, they're a coward. Moving up here and then refusing to do your civic duty as an American citizen to keep this guy out of office to the best of your ability as someone abroad would make me furious if they're sticking around here, so I'm really hoping that that isn't the case.