If you are in your 40's or 50's and have stayed in your career, you would be considered a leader in your industry. You have probably mentored younger employees, continuously learned new technology and kept up with changes in your field.
Looking at the picture of the window cleaner, we see a middle aged man doing a brain dead job that a monkey could be taught to do. The context is that he has chosen menial, low stress work so that he can devote his energy to spiritual matters, therefore he is happy.
Apparently, work enjoyment and satisfaction is closely tied to mental health. If you are working in the field you are most interested in, the happier you are. Of course there are exceptions to this and nothing is guaranteed but overall this is generally the case.
I'm not saying this guy isn't happy and I'm not saying owning your own window cleaning business is a bad thing either. However, anyone that has worked in a menial, repetitive job for decades, where nothing ever changes, is likely to question their life choices at some point. And once you feel that first hint of job dissatisfaction, it's hard to shake.
He chose window cleaning because he built his life choices on the foundation of a particular belief system. That was back in the 1980's - in 2024 that foundation has been completely changed.