Eating a gluten free diet often means avoiding junk foods such as bread, pasta, etc. So those people might be wrong in that they aren't gluten sensitive, but they're probably right that their diet improved their health.

It being a spectrum disease, I'm rather mystified how someone thinks they're sensitive but someone else can declare they aren't. I mean from the outside looking in, the label matters to the outsiders, but from the inside looking out, the exploding bowels seem a far higher priority than label achievements.

In my extensive experience with GF food if its naturally inherently GF its delicious, like a grilled steak or a fresh salad. I am hungry right now and I'm salivating eyeing a granny smith apple up and down right now, it is going to be so tart and juicy... If its artificially GF like a GF chocolate cake, its freaking disgusting like mashed potatoes mixed with shredded coconut levels of disgusting. The true irony of the "gluten free" aisle is its mostly inedible and the real "GF" aisles are the long existing produce and meat aisles. Aka the stuff that was "food" before there were food factories trying to convince us something more profitable is "food".