This Nature article claimed that two of the Chinese labs attempting replication provided XRD measurements that didn’t at all match what the Korean lab had. I’m not a pro in this field, but XRD gives you insight into the crystalline structure of materials. That suggests that whatever they made might not even be LK-99. I suppose the difference could be other contamination?

Is my understanding right? If so, slightly shocking that these replication attempts are garnering so much visibility.