Except the owner did live up to their side of the contract. Pretty much all
dvc rental contracts I've seen have said the points are non-refundable. So their end of the contract would be to book the room. That's why there's a risk in renting DVC points. Covid presented a unique situation, but there are others who have had to cancel for illness, etc in the past and unless they got insurance they were out the money. That's why these rooms are selling at a discounted rate. As someone else said, you can pay more to get the room from disney, but then have much higher flexibility.
I know they mentioned having 4 standard studios booked. If they would not . Standard studios are very cheap point wise and hard to get. Maybe the dvc owner doesn't have enough points to rent 4 studios pool view especially with the new borrowing rule or maybe the renter is unwilling to pay more for the additional points it would take or remove a day to make up the difference. I rescheduled my August trip which was booked in a standard studio and I had to lose a couple of days because the standard view had almost no availability and piece my stay together at 3 different resorts.