This is absolutely wrong. My father has DH, my aunt is celiac and my wife has a gluten allergy. My next door neighbor died earlier this year from problems relating to his inability to handle his celiac diet properly. I say this only to note that I have a lot of exposure to gluten related problems in my life.

In many people, my father for instance, gluten problems don't manifest themselves until much later in life, sometimes out of the blue, seemingly unprovoked.

While what you suggest may yield some cluees, only a fool would follow your advice about this being definitive (your words).