This has nothing to do with black swans, the birds... this has to do with unexpected results that are easy to explain in hindsight after the truth is known.

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.