What do you think is easier, making a possible superconductor, or popping it on top of a magnet and seeing if it floats? The latter is an "experiment" only in the sense of an elementary school science class.
Why are we so obsessed with finding out whether the original authors did their homework? Science is not about crediting or discrediting people, it's about collaborating and standing on one another's shoulders to find out truths about the world. If LK-99 turns out to be a superconductor, it doesn't matter if the original paper was glaringly incomplete. If LK-99 doesn't pan out, it matters even less.
Why are we so obsessed with finding out whether the original authors did their homework? Science is not about crediting or discrediting people, it's about collaborating and standing on one another's shoulders to find out truths about the world. If LK-99 turns out to be a superconductor, it doesn't matter if the original paper was glaringly incomplete. If LK-99 doesn't pan out, it matters even less.