Disney's resorts division runs those promotions to increase bookings of rooms that they own.
When you are a
DVC member and you're making reservations with your points at a DVC resort, you're booking room inventory that the DVC membership owns. It's a completely separate pool of room inventory.
To put it another way, when you book DVC resorts with your points, you're not dealing with Disney's resorts division - the people who are offering those promotions - at all. They don't get any money from your stay, so they've got no reason to give you free dining or tickets or anything else.