I believe the implication is that LK-99 is basically a demonstration of an entire class of materials which should have room-temp superconduction properties. IE we can enumerate through the entire class and find the ones with the properties we want.
In fact, the tight tolerances of this seem to indicate the opposite.
I have no knowledge in this area though.
[1] https://en.wikipedia.org/wiki/History_of_superconductivity#/...