That does seem like a bit of an exaggeration. But then, "state of matter" isn't particularly well-defined, as far as i know, so who's to say it isn't one?

Perhaps relevant to this is the point about band gaps:

> The Princeton scientists discovered a few years ago that hyperuniform materials can have “band gaps,” which block certain frequencies from propagating

That's a property that crystals can have, but disordered materials can't, right? So it's interesting that a non-crystalline material can have that property.

Quasicrystals and metamaterials exhibit the same phenomena. They were well known and studied in 2014. Regardless, having unique interactions with the outside world is not a new intrinsic state.