Have researchers found the best semiconductor of them all?

https://techxplore.com/news/2022-07-semiconductor.html

"advances ultrafast laser grating systems. Without  technique it would not have been possible to demonstrate the material's high mobility for electrons and holes... thermal conductivity the best of any semiconductor, the researchers say, it has the third-best thermal conductivity of any material—next to diamond and isotopically enriched cubic boron nitride. "And now, we predicted the electron and hole quantum mechanical behavior, also from first principles, and that is also proven to be true"