> It's something that literally has to be grown from the bottom-up, atom by atom --- in bulk, that's essentially a UFO-tier tech.
isn't that how your CPU is made?
The silicon wafers are grown from the bottom-up, but silicon is as chemically simple as it gets -- a pure element!
LK99 would be tougher to grow (correctly, and assuming that there is a specific superconducting configuration from among several semiconducting configurations,) by at least several orders of magnitude. Growing pristine crystals of such a complex and entropic material is something that has never been attempted.