Not safe enough to even try it. The dough is made off site in a gluten free faculty but that's about all that's done to protect its guests from cross contamination. Pizza is made from a line where everything is shared with gluten. Then it's baked on a stone that has previously had gluten on it, in a shared oven. No thanks. It could be safe for celiacs with just a little bit of effort with toppings and baked on a aluminum pan.
No