From the report: “Available hotel room nights is defined as the total number of room nights that are available at our hotels and at Disney Vacation Club (DVC) properties located at our theme parks and resorts that are not utilized by DVC members. Available hotel room nights include rooms temporarily taken out of service.”
So room nights available just depends on the volume of DVC bookings. When they report the overall hotel occupancy it’s only the Cash bookings and not the DVC bookings that are included.