No, we don't all ascribe to the NSD as gospel. I live a restricted starch diet, close to low starch, nowhere near no starch. Turns out I have coeliac disease as well as a suspected wheat allergy. I'm not super-strict about being 100% gluten-free right now, but that's circumstance; however I am completely wheat free. There is a distinct difference in my pain levels, in specific spots, when I eat wheat.
That said, I am one of those that does not believe that every case of AS is caused by kleb. p., nor do I believe that the NSD is the answer for every patient. We are all chemically, hormonally and biologically unique human beings. Massage helps some and not others; biologics help some and not others; NSAIDS are fine for some, but give others ulcers; NSD helps some and not others. No two patients present alike with AS and no two patients respond the same way to the same treatment. No matter whether pharmaceutical or holistic in nature.
I believe that a mix of treatments is probably the way to go for most people. Some geared to individual symptoms, others to what is, or appears to be at the root of the specific case.
Hugs,