Thank you for reading, I enjoy smart comments from smart people.
His personality discovery course teaches you to build your life around your personality, instead of transforming your personality through goals.
The irony is that following Peterson's advice will have a positive impact on your life, and so your personality will likely change in the process, making the whole course...useless.
I am not sure if I am clear. My reproach is that Peterson treats personality as something fixed that needs to be understood, instead of treating it as the by-product of your goals and environment.