Chasing through a bunch of links, their claim to "usefulness" seems to be based on this paper https://www.nature.com/articles/s41586-023-06096-3 https://www.nat

Chasing through a bunch of links, their claim to "usefulness" seems to be based on this paper https://www.nature.com/articles/s41586-023-06096-3 https://www.nature.com/articles/s41586-023-06096-3 where "Our benchmark circuit is the Trotterized time evolution of a 2D transverse-field Ising model, sharing the topology of the qubit processor" which sounds like a task picked to be easy for this particular quantum processor to solve, and maybe of interest to some physicists working with Ising models, but not really "useful" in the general sense.