I don't understand your points. Obviously the person was stating their anecdotal experience and how it made them feel. We engage in similar reasoning. We make decisions and draw conclusions based on our experience. It's a not a mathematical proof where the person is proving that the entire field is toxic. They are glad they got out of there.
Maybe I missed something but I don’t see where they claim to offer anything, so I don’t see why they should try adhering to this (completely unreasonable) standard.
Besides, the anecdote actually offers something: a perspective from someone who escaped the grinder just in time. I don’t have a cohort study at hand, but I know both first- and second-hand that the situation described is not the norm, but all too common. In such cases, the correct response is what was described: jump ship whilst you can. You don’t need a double blind study to demonstrate this when simple logic is enough.