They avoid mentioning this being a superconductor because it's not what it is. However having 0 resistance is a typical property of a superconductor, it's not the only defining property. I think the established defining properties of superconductors:<p>1. They have 0 resistance.<p>2. They have Meissner effect [1].<p>Being a topological insulator and only conducting along the edges I think (2) is not possible for this material. It's not like it makes it any less interesting.<p>[1] <a href="https://en.wikipedia.org/wiki/Meissner_effect" rel="nofollow">https://en.wikipedia.org/wiki/Meissner_effect</a>