People are being coy because occupancy is an infammatory subject here.
Some people feel that
DVC is best treated as a tenament, jam in as many as you can or want.
Others feel that the contracts they signed are worth something and they feel like they are being cheated when other over occupy their rooms.
The latter is pretty reasonable. The resorts were designed for a certain number of people, when people cheat and steal(over occupy their room) there are less resort ammenities available...ie:spots for the unbirthday party, seats on the bus, reservations at the eateries, etc, etc.
The rule is four plus one child under three, that is the agreement you signed or assumed when you bought, bought resale, or rented points for this stay.
Disney will probably not do bedchecks...for now.