No, your CPU is made from the top-down, via lithographic techniques.

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.