From the abstract:

>system-level coefficient-of-performance is ~15 for temperature differentials of 1.3 °C.

There's a long way to go. As far as I know, the leader in condensed-phase refrigeration cycles is still the sodium iodide ionocaloric method, which blew past all of the competing methods (magnetocaloric, elastocaloric, thermoelectric) when it was announced in 2022:

https://www.science.org/doi/10.1126/science.ade1696

...but the temperature drop of 25 C is just barely practical for air conditioning in warm (but not desert) climates.