This book is worth a read, for a few reasons, but as an experienced Dominant, I take issue with some things.
First, it is borderline abusive, implying to ignore safe words during punishments. This is absolutely unacceptable and it also implies some pretty harsh goals to achieve forcing safe words. Also, this is really a slave dynamic, and it's not framed as such. The title should be "Dom's Guide to Slave Training..." because this is not a traditional D/s relationship.
That being said, this book does have a lot of good ideas in it too. Most importantly, it provides a game plan for some important training ideas, like establishing a start phase, then a consistent phase, then an end phase, which it gives a lot of good information on.
It does get deep into the weeds of a wide variety of D/s relationship topics in very short order and you can read this book within a couple of hours, even taking notes, so in that sense, it is a decent read.
Just take it with a grain of salt.