Not completely true--you would have Phil and the other teams, several camera people at various points, the producers, film editors, etc. Maybe 50 people total. Let's say they all hae confidentiality clauses in their contracts (likely), I think it would still be tough to keep it from a spouse or SO, who then might blab. I jsut think the circle of "suspects" gets pretty wide, pretty quick. But you can bet, if the spoiler is true, that the producer is trying to track down the blabbermouth even as we speak, but it may not be that simple. Say you're involved in the editing, you come home and tell your spouse in confidence, she tells her best friend in confidence, she tells her sister... I just remember with Survivor All Stars, there was a detailed spoiler list that went through week by week, vote by vote. Well, the first 4 or so weeks were corrct, then it started to fall apart--but the final two were correct. Like someone knew the first few (in that case, the first few were seen together) and the last 2, but made up the other stuff.
Regardless, I still find this an interesting show.