Something incredible to note: it took around 5 years from when the transistor was first developed, to when it started to get integrated into consumer goods. LK-99 appears promising (and at the very least, may lead to other tangentially interesting discoveries), and if this is “it”, we could see commercial applications far sooner, especially if the synthesis is relatively straightforward. We couldn’t be on a more exci…
But that first contact point transistor, even if it degraded rapidly actually worked, the challenges were to package it properly and to make it smaller and more reliable. This stuff, assuming it is all true is more at the level of the first inkling that semiconductor diodes might be a thing. We still have to reach that transistor stage (which would mean we an expensive way to manufacture a small stretch of usable conductor, say a few cm). Then you can start thinking about high volume production in any desired length and commercialization. So from a strict materials science point of view there is still a ton of work to be done even if everything so far turns out to be true. There is a good chance that even if the material isn't superconducting in bulk small regions of it are (the chances of that are actually higher than that it is all superconducting) and there is still a good chance that they are simply mistaken.
But even if it is just superconducting grains smaller than a millimeter that would already be a massive discovery.