That's what I read also, but that would indicate things need to be running very effeciently.
My ME tags had "Room #" printed on them, but did not give a room number.
My guess is that their plan is that the luggage will come off the plane and get sent right to the resort and the ME # on the tag will match up with the reservation number and they will know the room number assigned (which I suppose means the room number is assigned before you check in).
I guess they are thinking that the time it takes you to get through MCO, check in with ME, and get on the bus, and check in will give them enough time to get the luggage to the room.
If they can get things running that effeciently, I'll have to hand it to them.