They did show a thin film sample in their paper, where they show the superconductivity measurement setup. They even mention it is a thin film sample of the material. looks transparent on the probing station. That is what they measured for superconductivity, not the rock/ingot form. That seems to be only a sort of magnetic demo for the material, nothing more. But the superconductive applications material seems to be thin film tech, as they state in their original paper.