You can log their usernames and then look them up on lodestone. You will find out a lot more about the truth this way. If they only have 1 class unlocked and the crafter/gatherer classes, then it becomes suspicious. If they go on beyond this and are part of a FC and the members of said FC only have players of the exact same setup, I say that raises a big red flag. But it's not our job to do SE's duty. All we can do is report what may be suspicious with circumstantial evidence at best. Whatever they find and do is up to them but I'm doubtful they will find anything tangible to ban these "players".