In business, the person on the other side has alternatives and they can walk away at any time. They don't even have to talk to you. You can be rejected because of the most minor thing or nothing at all. People say "no" all the time, and you can't send your coworkers into the building to murder them for it.
Voss just ignores the violent threat the criminal faces, and pretends the criminal is talking to him freely. But everyone in his negotiations knows every word he says is backed up with the threat of violence.
I got a very little bit out of it, but the useful bit could have been a blog post. The rest was egotistical crap that seemed to mainly be content-marketing for his business.
In real life, especially when you're younger than 60 and in business, every negotiation is part of an iterated game -- you are, much more than negotiating any single deal / job offer / contract term, figuring out who you want to work with, making friends and allies and partners along the way.
In those terms, most of that book is toxic, or at least sociopathic. That's fine if your only job is to get terrorists to put away their guns. But, it's definitely less fine if you are cutting a deal with someone who you will definitely intersect with multiple times in your life. And that's most people, it turns out. :)
Anyway, I think the book is super interesting, but I think technical types or those with a bit of ASD may find the relational approach hurts them more than winning any particular negotiation.
"Innovators Dilemma" - helps put in perspective acceptable state of early products and good strategies for deploying new innovative products