I think you are missing my point − if you design a UX with this user type in mind you would have avoided the problem described in the article from the beginning

I think you are missing my point − if you design a UX with this user type in mind you would have avoided the problem described in the article from the beginning. 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.