Yes, I read the linked article, and I understand the FODMAPS point (I was familiar with FODMAPS before reading the article)
My point was that many people (myself included) who are diagnosed with non-celiac gluten intolerance don’t have gastrointestinal issues, so testing simply for gastrointestinal issues doesn’t cover the whole gamut of potential reactions.
The people I know who have self-reported non-celiac gluten intolerance often have symptoms presenting in other ways, linked more to autoimmune issues: skin disorders, headaches, etc.