It's not BS. I don't know what happened that summer after the Championship but those two were never the same after that. Although, to be honest, they were never as close on a personal level as most people thought. Dont get me wrong, they were cool off the court but they definitely have always had their own guys that they hang out with. Haslem is the exception. He is very close friends with both Shaq and Wade.
Look, I don't ever believe it when someone posts randomly on the internet and claims to have some "inside info" especially when they don't give specific info or sources... but I'm going to be that guy because I do have some friends who are in the outer circle of some of the guys on the team. Shaq and Wade had a very "professional" relationship. But I can tell you for sure that there is some friction between those two, and it was going on even before last season. I have no idea what started it, and the people that I know who are aware of these things don't really know the exact reasons either. Wade won't be the one to ever let anyone in on it either so we won't know unless Shaq spills the beans. It might be something as simple as personal and professional jealousies. I don't think it was any one incident.
Again, I really don't wan't to come off as the guy who claims to know something he doesn't. But in all honesty, I can tell you that the media is on the right track on this one.