why assume differently here?
From the content of his works it is obvious he doesn’t and hasn’t been involved in corporate America (AKA “the outside world”). He isn’t a Gadol whose statements should be valued as “Da’as Torah”.
Truthfully, other than this book, I have no idea who the “rabbi” is and what he does for a living. If he has qualifications and expertise in interpersonal relationships in a workplace (a doctorate in business administration, perhaps?) , I’m willing to change my views.