Cryogenics is only an optional part of the standard. You'll need to make sure both devices support the USB D pd420.69 spec otherwise you'll never get the full rated speed.

Stupid usbif always making critical features optional.

Any superconductor will do actually, it's just that the ones we have at this point need to be really frigging cold. A room temp superconductor is the dream, and would function exactly the same as one that only works at a few kelvin.