Any phone CM that's telling anyone anything definitively about resorts in 2021 is shooting from the hip or just mistaken. The powers that be at Disney don't even know at this point. It seems as if they are playing things by ear, so to speak, leaving the option to open those additional resorts IF they can and the occupancy warrants it. My personal sense, based on other timelines and announcements, is that they are planning as if the remaining resorts will be closed until/into 2021. Many places aren't expecting things to resume to any air of normalcy until mid-late 2021 and I would expect the same for Disney, given the precautions they've been taking.
If I had a December trip booked at POFQ, I would try to move it myself to ensure I got a resort I was happy with. If you want to roll the dice and see where Disney puts you, that's an option too. Occupancy, attendance, and travel all around is low right now and will be for the foreseeable future, so I'm not sure availability is something I'd be concerned with.