How is becoming incapable of doing what you trained your whole life for, due to too much of it not burnout? He even lists symptoms he experienced.
Jacques was lucky that he had funds to start something unrelated (like living his life) and productive, but he kept repeating that his business could suffer if he didn't have people who could take care of it (or whatever). The fact is that he couldn't bring himself to do what he was doing until that point of life to make a living.
What does define burnout then?