So as it turns out, this is a group booking (as I noted in an earlier comment) and the deal with NCL is that they have given the group "price protection" on the cabin categories being held by the TA (that is, if the price goes up after the group was created, guests can still book those cabins at the original price). One part of that deal is that all the FAS offers will be included if guests want them, but they can't decline separate parts of FAS (e.g., the Beverage Package).
Many thanks again to those of you who offered your information and experience.