Yes, when going through the process, it’s seemlessly switches between Disney Destinations and Walt Disney Travel Company. Most don’t notice it.
If you mock book two reservations, one RO, and the other with dining added, and get to the point where you click on terms and conditions. Click on the terms and conditions. The RO will specify it’s sold by Disney Destinations. The one with the DDP will say by the Walt Disney Travel Company. This will also spell out the two different deposit/cancelation policies.
When you went to book, selecting the DDP changes you over to the Walt Disney Travel Company.
My initial post was about if you first book RO,and then later decided to get the DDP. Booking the DDP with your initial booking is a different thing.