Are you sure? Directly from the promo terms and conditions - https://www.ncl.com/about/terms-and-conditions/promotions
Specialty Dining Packages include one main course per person at Cagney's and Le Bistro
Additional main courses will be charged at the a la carte price listed on the menu
I see no mention of limits on apps or desserts...
A good general guideline, but if your state has a vaccine passport app (such as my state with the Excelsior Pass), that can also be shown. I made sure to show them exactly what it was and they accepted it.