I go oldham sixth form and there's a large asian group there, and most of them who do like football support manchester teams, they wouldn't have been brought up supporting oldham because it is most likely that their parents or grandparents migrated here, and I doubt they would have chose oldham as their team when they did.
I don't think I've actually heard of any of them actually going to the games. Most of the time when I hear them talking about it after a game is "did you watch the game" which strongly suggests they watched it on the TV, so in the end I think it's just more cases of armchair fans more than anything.