We stayed one night at Riviera in early February using credit card reward points. When we checked in, DH pointed out to the front desk that we were DVC members, and they immediately took off the parking charges. So I believe that
@ScubaCat is correct - a DVC member staying at a DVC resort doesn't have to pay for resort parking no matter how they're paying for the room.
Here's the copy and paste from the Member website:
Q.
Will DVC Members be charged for parking at a Resort hotel?
A.
Members
will not be charged for standard overnight self-parking when staying in a Disney Vacation Club Deluxe Villa at Walt Disney World Resort, Disney's Vero Beach Resort or Disney's Hilton Head Island Resort, regardless of whether they use Vacation Points or another form of payment. Members also
will notbe charged to park when using Reservation Points to stay at a Walt Disney World Resort hotel.
A Member who chooses not to use Reservation Points for their stay at a Walt Disney World Resort hotel in an accommodation other than a DVC Deluxe Villa will be charged for standard overnight self-parking.
Disney Vacation Club Members who wish to shop, dine or enjoy activities for the day at a Disney Resort hotel are not subject to the overnight self-parking fee. Charges for valet parking will still apply.