I mean, in context, it was a joke. I even said, "A member of our party joked". So - it was supposed to be a silly statement, that was the intention.
They weren't actually saying though, that Carnival shouldn't do deck parties, but that they should do a second movie, like they used to. Move the deck party later, or in between the movies, and let people use the night clubs during the movie. That's what they were saying, in context.
They don't care if Carnival has deck parties, pretty much all cruise lines do. However, the reason we were given that night as to why they weren't doing a second film, was because there was a deck party. They could have had both. Was never an issue pre-2020.