>Firefox 81 removed unnecessary simulations for protanomaly, deuteranomaly, and tritanomaly, and added a simulation for achromatopsia (no color).
Considering that these are developer tools, *anomaly-variants could be considered "milder" forms of the *anopia-variants, and further come in various degrees.
Further, people with the *anomaly variants can have severe headaches with certain color-schemes, and the best thing to avoid any misunderstandings, is to check for "safe-for-anopia", or/or use a scheme that avoids these altogether, which will also serve everyone on the *anomaly-spectrum.
But that's just my speculation.
The real issue is using a colour photo like the one used in the article because this doesn’t demonstrate the effect of low contrast - a demonstration of lost contrast is much better with bodies of text against problematic background colours, since there is an immediately obvious reduction in legibility, rather than a bit of flourish in a photo.
I will say that I can barely tell the difference between the original example image on this page and the deuteranopia one. According to tests I have a moderate deuteranomaly.