In using the term syndromes, I think they are deliberately creating the impression that any fatiguing illness without an established pathology is essentially the same, so they include ME/CFS, Long Covid, as well as burnout and other stress related problems. Then they assume it's all stress related.
It seems odd reading the stuff in this silly article suggesting we choose to lie in bed in darkened rooms, with the implication that we are either malingering or misinterpreting ordinary fatigue as pathology and give up trying to be well or afraid to be active - while at the same time as reading another thread about a thesis where we're perfectionists who keep pushing ourselves to behave as if we're well and not accepting our illness, and need to learn self compassion.
It's the same old story, either we push ourselves to achieve and boom and bust, or we retreat from everything and are afraid to move. Either way, the conclusion is the same, we're at fault and need therapy to set us straight. It's so incredibly patronising, especially coming from people who have spent years patronising and othering us, not listening and still haven't a clue.