Reading the paper, they don't even have an actual material. This is a theoretical result about the kind of material that ought to work. Which is a step forwards, but not a breakthrough.
Reminds me of when my dad and his colleagues researched a radical new technique to create solar sells at minuscule costs. In the end the physics proved the hypothesis would never work, which was like putting a sign at the start of a road labeled "DEAD END." No sense getting our hopes up until the science backs up the theory.
