Can't say for certain but wanted to share what I see in my cruise planner for my upcoming cruises. I don't have either booked.
UDP for Oasis wording for December.
What's Included
Unlimited visits to speciality dining restaurants every night of your sailing and lunch on sea days.
For restaurants with a la carte pricing, you’ll receive a $35 food credit, with the exception of Port Side BBQ and Playmakers which will be $20.
For ships with these venues, Teppanyaki/Izumi Hibachi is included, with a $10 surcharge, Chef's Table is included, with a $49.99 surcharge, and Dadong is included, with a $35 surcharge. These will be charged once onboard.
UDP for Harmony wording for February.
What's Included
Unlimited visits to speciality dining restaurants every night of your sailing and lunch on sea days.
For restaurants with a la carte pricing, you'll receive a $20 food credit
Teppanyaki/Izumi Hibachi is included, with a $10 surcharge, Chef's Table is included, with a $49.99 surcharge, and Dadong is included, with a $35 surcharge. These will be charged once onboard.
RCI = Really Consistently Inconsistent. I wouldn't cancel. If you get on the ship, ask at Izumi on day 1. If they say it isn't, you can cancel then before taking advantage of any of the meals.
I had UDP on Odyssey in February and it was the $35 then. My wife and I ate there at least 4 times (twice for lunch) and each time used the App, 2 rolls and dessert option. The sushi chef even made us a special/extra role one time which wasn't on the menu and it was fantastic. No additional charge. Good luck and hopefully it will work out for you.