It's a big deal for material scientists studying superconductivity but irrelevant otherwise, at least for now. Theoretical research on superconductivity practically hit a wall decades ago and there's been little to no progress despite significant amounts of effort and countless world changing applications like MRIs, NMRs, particle colliders, etc. A third type of superconductor might provide the missing data we needed to make real progress and unify the different types of superconductors under one theory.