Interesting but a cheat?
Surely they have just swapped temperature for pressure? I know boyles law doesnt work for solids but I presume the powdered state or the immense pressure gives some compressibility, which results in some hirthertoo unknown effect on the electrons?
This seems as unlikely to result in a useful superconductor as supercooling it.
Are there any good examples of pressures this high being generated outside of a lab. (ie where a wire would need to go)
I think its a cheat, an interesting cheat, but seems like a dead-end to me. They might as well as said we can make it out of Neutronium or Unobtainium.