I don't see how it's an argument against finding a job in the trades that not literally everyone can do that. Not everyone can be a doctor either - doesn't mean you shouldn't chase that if it's what you want to do. Tons of people are more or less succesfully climbing the corporate ladder and have no desire to do anything else. This advice isn't for those people but the ones that are struggling with that or worrying that it is not AI proof - there are alternatives to it.

And yes nowdays I do own my bussiness but that wasn't always the case. I had a higher income as an employee. I traded that for more freedom and meaning.