Milk doesn't contain gluten. The study by Rowe is about milk protein but it looks to be extremely badly done. It is difficult to know how accurate the report is but apparently there is no test for milk protein intolerance so it was just diagnosed on hunch. People diagnosed on hunch were better after stopping milk. This is the sort of pseudoresearh that we spend most of our time trying to bring to a halt - PACE, SMILE, whatever. We cannot complain about bias in BPS studies unless we are fully aware just how much it affects all studies.