Ohh ... this could actually be relatively big. From abstract: "The superconductivity of LK-99 originates from minute structural distortion by a slight volume shrinkage"

There was previously research done investigating how changes in atomic structural alignment affect superconductivity (such as by cooling). I think researchers were trying to maintain the spacing that superconductors had while cool even when it was heated up. This sounds line with that other research, though I can't find the article again, please correct me if you find otherwise.

Still likely to be rather fragile and temperamental to work with ... but this seems like it's possibly legit.