Gotcha. I appreciate the reply. I understand what you were thinking now, but I reject that assertion, at least for my comment. In it, I explicitly accept the p

Gotcha. I appreciate the reply. I understand what you were thinking now, but I reject that assertion, at least for my comment. In it, I explicitly accept the possibility that he's right, after warning him that based (only) on the text of his comment, he might not have sufficiently guarded himself against a confirmation bias. I replied because the way he described it is classic of a "remember this hits, forget the misses" cognitive problem. There's no prospective testing described (other than the initial elimination of gluten from her diet). Their confidence seems to mostly rest on post-hoc examinations of diet once something is noticed (so you're missing most of the data and potentially most of the misses) and even gives himself an out if they do an examination and it does miss (the reference to needing a "deep enough" investigation, implying that he open to chalking up a miss as that this time they just didn't look deep enough).