The background of the author is in Counseling Psychology and it sounds like he didn't finish. When talking about behavior applied to decision making it's mostly going to be within Social Psychology. As a result, it seems as though the author has an advanced level of undergraduate Psychology applied to investing. I find this area to be very fascinating because I have Ph.D. in Social Psychology.
The discussion about self-esteem is supported by research. However, I don't understand how is applies to investing. There are much better applications elsewhere.
In the show notes there is a link for the intelligent investor. IMO, I think that book is better. It's applied to securities, but you could apply the principles to anything.