People remain under a very strict um... Silence clause (I know there is a real term for it but I can't think of it atm).
I'm fairly certain he "can't" say anything until the finale has aired.
My brother in law won a HGTV show and he and my sister didn't say word one, they were strictly "forbidden"... She threw a huge party for the finale so we kind of figured he won but they didn't let on at all, just kept saying that it's so exciting he made it to the finale. It was intense all the way until they called his name, lol.
I wouldn't be surprised if he's not supposed to talk about it until the end, regardless of when he left. That said, I do hope he comes back. I didn't think he deserved to go home, at least not from my couch's vantage point. /twocents.