Yes. Don't even need to read it. Anytime you read the sentence "our definition" it's wrong. There is no such thing as "burn out". It's a marketing term. Practice root thinking (https://breckyunits.com/root-thinking.html). Ignore marketing buzz words, especially if they come from social sciences like psychology, psychiatry, et cetera.

Obviously fatigue is a thing and you need rest, but don't believe anyone who tells you you have some easily labeled condition—it's almost always B.S.