From your final quote :
This idea fails logically in the case of endometriosis. If nociplastic pain occurs in conditions in which tissue damage is non-existent or not visible then how can surgeons ever declare that they have found "very severe endometriosis", and what makes that different from surgeons finding "mild endometriosis". Such gradations of severity of the condition could never happen if the condition was invisible. Endometriosis damage is visible - if surgeons look for it and know how to identify it when they see it.
If endometriosis was not visible then every woman diagnosed with the condition would have the same degree of damage i.e. none.
I hope that makes logical sense...
I've read a lot of anecdotes from women being found to have endometriosis which was visible on bowel, bladder, rectum, anus, intestines, kidneys, diaphragm, lungs, in the nose, the ears, and in the brain in which case the idea behind nociplastic pain is dead in the water. It just suggests that a group of people want to do a superficial look into women with pelvic pain and then dismiss them.
I hope answering my question hasn't wiped you out for the next month.
Edit : For anyone who wants to actually see endometriosis, or read up on it, this rather dated (but otherwise helpful) website has various videos showing the condition being found during surgery.
http://endopaedia.info/