The parent is making a distinct difference between what the industry typically refers to as "burnout" and what actual, physical, burnout is. As someone who has gone through phases of burnout and currently working through yet another one in my career I can attest the parent's definition IS the correct one.
You are not burned out when you are bored at work. You are burned out when you are so tired of doing something that you cannot bring yourself to not only do it, but anything else. When you need drugs to get through the day. It's a combination of depression/anxiety/fear of failure that manifests as what I can only describe as a feeling of wanting to disconnect from everything forever and sleep. The only solution is to disconnect for a long time. I, for example, have not programmed as a hobby in almost half a decade. It's the only way I can stave off repeated bouts of severe life crippling burnout.
Be far less sensitive. Also, perhaps you should try to experience burnout before a needlessly pedantic out-of-nowhere virtue signal.