Yes, given the Cu atoms seem to be ~8 Angstrom apart the flat bands are to be expected. So its not clear what "special" about these, given if you just had dilut

Yes, given the Cu atoms seem to be ~8 Angstrom apart the flat bands are to be expected. So its not clear what "special" about these, given if you just had dilute Cu impurities in some otherwise insulating I'd imagine you'd have something similar for the Cu d-bands.