Ah, I see the confusion: this book isn't about changing our emotions. It is about learning from them.
There are aspects of CBT that are essentially gaslighting ourselves, ignoring the information we could get from our emotional responses in favor of becoming more socially acceptable. It is part of why it is contraindicated in cases of cPTSD.
This book is about a very different goal. It is about what can be learned from our built-in sensors, rather than how we silence their alerts.