> My issue here is: This new material is essentially standard "high temperature" YBCO superconductor material just slightly modified, or? The authors are not doing anything dramatically new, like a new chemistry.
AIUI The only thing in common is they both contain copper.
Not an expert either, and extremely skeptical myself. The poor videos claiming to demonstrate levitation just seemed to show diamagnetism and eddy current reactions.
There is no Pb in YBCO, what are you on about?