The limiting factor for quantum computers is keeping them cold. Is this triple superconductor high temperature too? If not, it's not going to change things much.
(There are probably a lot of other nasty details, but less than 4K is harder.)
7K is considered “warm” from a cryogenics point-of-view because you can just dunk your sample into a dewar of liquid helium at 4.2K. You can even get it cooler, down to about 1K, using evaporative cooling techniques. [1]
It’s getting to lower temperatures than this when things start getting complicated. Eg a closed-cycle evaporative He3 system can get you down to 200 mK, or you can bite the bullet and use a dilution fridge down to around 10mK.