Pretty much everything.
When I went around a month ago, there were all kinds of salads and terrine, sliced meats, soup, and various shellfish for starter, mains included beef, chicken, duck, veal, salmon, and bass as well as vegetable lasagne, and a whole pile of amazing desserts too. Whoever told you it's seafood was misleading you – the shellfish, prawns, and similar occupied around 20% of the buffet on my visit, but that was all.
Like most things in life, you get what you pay for
