And what is "soft matter"?
Condensed matter is stuff that is not gas.
Soft matter is shorthand for soft condensed matter, which is stuff that is not gas nor solid.
Fluidics, liquid crystals, polymers are examples of soft matter.
Source: I am a soft matter physics PhD that focused on liquid crystal phase characterization.
https://en.wikipedia.org/wiki/Black_swan_theory
"Taleb's "black swan theory" refers only to unexpected events of large magnitude and consequence and their dominant role in history. Such events, considered extreme outliers, collectively play vastly larger roles than regular occurrences.[2]:xxi"
This discovery (unexpected behavior of matter) seems like it'll have a surprising and large magnitude.
It just means something very rare, and that's been the common meaning of the phrase in English for hundreds of years. It comes from Latin.
"Materials can be broadly classified as hard or soft matter. Hard materials, like metal alloys and ceramics, generally have a very regular and symmetric arrangement of atoms. Further, in hard matter, ordered groups of atoms arrange themselves into nanoscopic building blocks, called unit cells. Typically, these unit cells are comprised of only a few atoms and stack together to form the periodic crystal. Soft matter can also form crystals consisting of unit cells, but now the periodic pattern is not at the atomic level; it occurs at a much larger scale from assemblies of large molecules."