To answer my own question, this special meal is not available for a solo diner.
I made a reservation, called and asked and they said I could order it. When I showed up the hostess said she wasn’t sure but sat me anyway. Then the waiter came over and he too said he wasn’t sure, so he went and asked and came back to say no. To me it was a deal breaker so I was going to leave and eat some of that delicious looking stuff upstairs in Pizza Ponte, but the waiter said he’d go ask the manager. The manager said they don’t offer it for 1 but said he’d ask the chef. After all of that he came back and said they’d make an exception, and boy was I glad. It was an incredible meal, great for the price too considering Disney prices. I got everything on the menu but a solo serving which was still a lot of food. Very tasty and well prepared, so I would certainly recommend it to anybody on the fence.