From what I’ve been able to gather, the Disney Wholesale department (UT, Travelocity, Expedia, etc.) and the group travel division (which is what I think MVT books under) have separate buckets of room inventory from everything else. I do know that lots of guests who booked through MVT for resorts in July that aren’t going to be open got moved to the Poly. The only thing that’s certain is it had to be an equal move or better. They won’t move you down to a value, but it could end up being another moderate or a deluxe, depending on availability and how many in your reservation. Like, if you booked a 5th sleeper room and there are 5 on your reservation, they have to move you to something that sleeps 5, which may mean an upgrade.