I've not met this specific method, but I have found that with the standard breathing recommended. It took months of experimentation before I found a slow breathing pattern that works for me without hyperventilating. I had to slow the whole process, and increase the gap after breathing out. It is worth persisting to find something that works.the breathing almost feels like a panic attack,
In 3 of my cbt sessions i did breathing to hyperventilate to mimic a panic attack, then be curious about what Im feeling and what is happening. For me it kicked up specifics of traumatic event... I think it helped though for my brain to learn it can tolerate panic states and that fighting them or fearing them makes the experience worse, and just sitting through and experiencing it makes them pass through more easily and not happen then as frequently--it's weird the brain got somewhat rewired by doing that. I only the did "homework" of doing that on my own a few times. In the workbook on Panic the author describes the exercises much better. They helped me. No question about that.the breathing almost feels like a panic attack, so not sure to continue.