I feel like the author is, funnily enough given the context, lumping in self-understanding and self-reflection of any kind into a single category. A tool (analysis) that is used to grant you agency is equated to an identity kit (a label) that removes your agency and puts you in the box that the author describes.
You can have great self-understanding and self-realization about your childhood, your parents opinions and personality without letting it define your life.
You should not blame the analysis itself, but blame the projection of your personality to the result of it, which it encouraged by platforms that make money of it, like TikTok or BetterHelp. It can be fun to do an MBTI or Big 5 test to see common patterns in oneself, it does not mean that you have to structure your personality around the outcome.
To me, it sounds like the author is vouching for being unthinkingly driven by biology, tradition, and impulse in a society where most of this is also commercialized. Your govt wants you to have children to supply pensions, your impulses are driven by the advertisements that you have been bombarded with during the day, there is extreme prodding towards certain kinds of sexual looks or behaviors that influence what people find attractive. You are as much of a product when you follow the impulses than when you dont, the only thing is that with self-reflection you have a small change to question and think about why you want a certain thing.
I personally think that people living by the authors suggested way of living in a western societal moment of individualism have a maximum chance to regret their life at the end of it, doing everything "default" that society and tradition has taught you is "natural and human" instead of living the journey on your own terms and doing what you actually like.