That is an incredibly good book for obtaining an insight into who Trump is as a person, and how he operates as a businessman. There’s a whole chapter on how he negotiates.
Yes, the techniques are SOP for an experienced entrepreneur.
Another trait is to trust a stranger until they prove they are untrustworthy. If they prove untrustworthy they are, at best, a non-person and, at worst, an enemy.
When Trump moved from the business world to Washington he was astounded at the number of untrustworthy people he has had to deal with.