The solution to robust user interfaces is not to just whack labels on images saying don’t click on this, but to step back and assume your user can’t (or won’t) read, can’t (or won’t) do anything mathematical, and also who loves to randomly click on things. Build for the worst possible user in mind and you will avoid a lot of problems.
For example, if the author had assumed that people like to randomly click on things then they could have created a pop-up that said don’t click on this, use the menu above.
This raises a really interesting point which is the cognitive elite are responsible for designing systems with zero empathy for the rest of the population. It is much harder to design a system that anyone can use and most system designers really don’t make the effort.
I work in a UX role and my yardstick is whether my mom would understand it.