There’s an old magician’s rule. Say you are using mirrors to make a beautiful assistant disappear. It is fine to tell the audience there are no ropes, no trapdoors, no switching of the lovely lady, no fake sides in the box. But you must not say there are no mirrors. So doing would not only be untrue, it would also draw attention to the possibility of mirrors.
I think the brochure-writer here is telling us there are no mirrors. But I can see one in picture 1.