A head-scratcher. Not even the experts agree so lotsa luck deciding whether it's junk science or the keys to the kingdom.
I can offer one insight, or rather, data point.
Most to all of his point is that gluten is bad. For instance, [paraphrase:] 'it causes autism'.
I have autism and tested his claim by a month of high gluten intake. My symptoms didn't worsen.
So i suspect that even if he's right, it's a relatively minor matter.
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Grain Brain