The way the letter reads to me is that if you are not a current member as of today you must buy direct to be eligible for the perks listed. The problem with new buyers currently undergoing he resale process is that they would have to get the seller to agree to terminate the contract as the agreement is between those 2 parties not the buyer and
DVC. Unfortunately DVC has always explicitly said these perks could be terminated and not to purchase based on these perks. they are not park of the ownership agreement so I don't believe a buyer would be able to terminate a sale (without penalty) because these benefits were terminated.