Mouse model study [1]. Intriguing, but far from meriting behaviour changes. Meanwhile, your Huffington Post author cites a largely-discredited glyphosate study [2] in the middle of an anti-GMO rant [3]. (Wikipedia is generally more reliable than the Huffington Post.)
I believe that the popular opinion by many is that they do not have NCGS. TV personalities like Bourdain drive this heavily by discussing how gf used to not really be a thing in restaurants, but now is quite popular.
The more recent research -- by the people who originally studied NCGS -- is that the earlier studies may have been detecting sensitivity to other things, and that NCGS may not exist at all.
I think there many people who think that gluten is evil but seitan is an amazing vegan food with wondrous health benefits. Given how the placebo effect works, it’s entirely possible that both are true in a bizarre sense :)
My personal belief is that a lot of “gluten intolerant” people derive considerable benefit from a low-gluten diet because many low-gluten diets have less starch.
No, for people without Celiac’s, NCGS, gluten ataxia or a wheat allergy gluten-free eating is a fad diet [1].
[1] https://en.m.wikipedia.org/wiki/Gluten-free_diet