I'm not so sure about that, only because I know for a fact that you don't have to have you DDP attached to any park ticket or package.
I always purchase this way:
I have an annual pass. (just me) Therefore, I book the room and I get an annual pass room discount. (only one person in the room has to have an annual pass to get the discount) I also buy the DDP for my family, which is allowed with the annual pass discount.
I buy the parkhoppers from
AAA, and they are not linked in any way to our DDP. They are completely separate passes.
Therefore, if I had a 2 year old that I want to buy the ddp for, yeah, I'll have to pay the child rate...but he's under 3 and therefore I still do not need to pay for a park ticket. I can't imagine a company like Disney is going to tell you "NO you can't spend any money on our meal plan because your kid isn't 3 yet" LOL
I suppose it you bought a "package" deal, they could slap it on, but I never buy my vacations that way and I always make out better than their supposed "packages"