I was saying almost exactly what you're saying. That they did what was easy (made sense) for them and don't care what kind of deal you get or don't get at resale. Fair is not their concern - not that they are unfair or are even attempting to be unfair. It is not up to them to decide what's fair because there is a bigger picture in a resale contract - maybe you're paying more per point but seller is paying closing etc etc
Though, refunding a new 2021 owner (if they are not the same as the 2020 owner and did not pay 2020 dues) may not truly be fair in the eyes of many (including me), it not their
responsibility to do it any other way. It is the responsibility of the buyer / seller / broker to hash it out.
One more try at clarifying.... I still don't think
DVC "cares" (nor should they), and I don't think they're wrong in their process.