Does he talk about exercising while in pain at all? This has been something that really worked for me after tearing my achilles. After 8 months it still felt irritated 24/7 and I was terrified of re-injury, but ramping up the intensity of my ankle/calf exercises started to make it better. The harder exercises were probably having a minimal impact on strength, but they were having a huge effect on convincing my brain that the area was fine and it could drop its obsession with it.
From what I can recall, he does encourage people not to stop exercising when they experience psychosomatic pain. The idea is that stopping exercise because of pain gives it validity.
But I would add that one should be careful when exercising and stop as soon as the pain is more than a nuisance. I have pain in my ankle and after trying to sprint through the pain I couldn't walk for a couple weeks. Then when I started going on really easy runs and slowly ramping up the time/pace, it finally started to improve.
He doesn't specifically mention exercising IIRC. Although I found that lifting is another tool I can use to distract myself from the pain.
He does encourage patients to stop any and all forms of physical therapy. I had already stopped PT by the time I read his first book. But I do remember thinking that the PT was making it worse.
All of the stretching and specific exercises were only causing me to focus on the pain even more which lead to even more pain.
