By that logic, white, black, grey or brown or pink does not exist either. The article confuses human color perception with wavelengths. It is not that purple do

By that logic, white, black, grey or brown or pink does not exist either. The article confuses human color perception with wavelengths. It is not that purple doesn't exist, it is just that a rainbow does not contain all perceptible colors because it only contains colors represented by a single wavelength. Just like our ears can perceive chords as different from a single "average" note, our eyes can perceive combination of multiple wavelengths. It doesn't require any pop-psychological explanation - you can easily make an electronic device which detect the color purple. It just needs to be sensitive to more than a single wavelength.