The article is paywalled, but from the part I could read, it sounds like they’re just making hyperbolic colors, which is a pretty well known phenomenon which you can experience at home: https://en.wikipedia.org/wiki/Impossible_color#Chimerical_colors
They’ve done it using a new technique which is cool, but seeing super saturated hyperbolic colors is not a new thing.
Similarly, I think I’ve read somewhere that pink isn’t in the color spectrum. Or was it magenta?
Pink is a shade of red, so pink itself is not a real color.
A lot of colors, like those, as well as gold, aren’t on the spectrum of visible light either.
I’ve always wondered why no one ever seems to mention that there’s no such thing as brown light.
It’s orange. Brown is just really dark orange.
It could be a very dark red or yellow as well