And this was reported by who? A gossip column? Were they for shooting or auditioning? Again, till the studio goes out and officially confirms the cast, nothing can be considered set in stone.
No, actually, Retroman found a guy who works at the hotel and emailed him and asked him. I also found his blog, and several days before, he had posted (for his friends not for news or gossip or anything) how he had met Cabrera, Cotrona, Brody, Palmer, and a few others not rumored with the film like Russell Crowe and Giselle Bundchen. So obviously the guy wasn't out trying to fool anyone or anything and probably had no idea that we crazy fans would seek him out and ask him questions and stuff. He was just typing along about his life in Sydney, friends, etc.
And you're right. I don't think that proves that the casting is set in stone - just that the movie is moving forward.

