The "mathematically balanced" description seems to be selling itself short actually. If you check the actual description, it says "By using the perceptually uni

The "mathematically balanced" description seems to be selling itself short actually. If you check the actual description, it says "By using the perceptually uniform colour space Oklab, I was able to achieve perceptually uniform hue differences between each of the accent colours, ensuring maximum differentiability between highlighted words. Constant chroma ensures none of them stand out from or recede into the page more than others." Doing the balancing in Oklab specifically addresses your point about perception in our eyes.