That group is mainly for city employees, and they know they can get into big trouble for having loose lips on the internet.
The park has been coming down harder and harder on it over the years. Plenty of people have gotten into trouble for posting on this board and for posts made by others that could be traced back to them. That's one reason we don't get too many current employees through here anymore. I used to be much stricter about the "speculation" threads to help keep down the drama, but at this point it's just like any other park has to deal with.
It's still against the rules to outright spill the beans, but "speculation" is fair game.