you are correct.
We have booked 2 trips this year through AAA. We are on the basic dining plan for each and have HDDR booked for one.
I called WDW-DINE, told them I was booked through AAA, MYW + Dining, and they were quite helpful in making all my reservations. I had to give them the CC# for booking, but nothing was charged at the time. She stated several times, that charges would only occur if we didn't show and failed to cancel.