Agree!
IMO, this is just a clever way for Disney to get something for the empty standard and savanna rooms they have (no matter the source of those rooms. Could be from Members trading points for a cruise or other option, or just points Disney owns).
By offering value and then upgrading the cash guest to standard or savanna, Disney doesn't have to discount the higher cost rooms, but still gets some cash from them. They probably get more from this strategy than they would from discounting the higher cost rooms, and they don't have the risk of cannibalizing from their own customers who were willing to pay the higher prices for standard or savanna rooms to begin with.