First thought is that this is photoshopped, because the image shows one of the main problems right there with stuff slipping off the sink into the toilet. From a design position, it seems this might be desirable to keep pee from going between the toilet and sink? But then what about the other side? It doesn’t make sense. Then we get to the maintenance nightmare… sometimes they have to remove the toilet to get at the drain, and sometimes you want to upgrade or have to replace your toilet. A better idea would be a removable after-market item that provides the slope.