It's a buffet, I suppose you would just eat whole foods and avoid breads, breaded items, and pasta. They have a good variety of proteins, veggies, salad, potato bar, fruit.
I'm sure the server can tell you if the fried chicken or corn bread has gluten in it, or if anything else has gluten. Sometimes the head chef comes out and will talk to you if you need anything, one time we had an allergy listed in our reservation notes for someone in our group.