This seems like a pretty low-level detail that doesn't warrant being heralded as a "breakthrough." They apparently have a new, more efficient power electronics

This seems like a pretty low-level detail that doesn't warrant being heralded as a "breakthrough." They apparently have a new, more efficient power electronics to supply electric current to the superconducting coils. The electronics are situated inside the cryostat, so they are also cooled to very low temperatures apparently (few degrees Kelvin). The article is really vague, though.