That article is a bit airy-fairy. It mentions Celiac disease and it mentions that limiting gluten can help some other instances. They then give no reason for gluten being good for you....just the claim it is.
I do agree with their point that if you are not Celiac and give up gluten and see improvements it is worth checking if there is some other problem just to be safe but that is not a reason to keep eating it.
Read Wheat Belly (and many other supportive studies) if you have any more questions about the effects of gluten...nasty stuff.