There is no connection between
DVC and the DDE card. DVC members cannot buy the card just because of their membership.
Many DVC members will buy the AP with the DVC discount. Then as an AP holder they are eligible to buy the DDE card (now the Tables in Wonderland card, so as not to be confused with the
DDP plan)
DDE is strictly a discount card. Are you thinking of DDP which DVC members can purchase separately when staying at a DVC resort?