I am allergy and intolerance testing 20years now. From the very early years we were finding people showing to have Gluten Intolerance. We would advise them on a Gluten Free Diet and they would instantly feel 100% better. But yet when going to their medical practitioners they were testing negative for Coeliac Disease. This is when we realised that it was possible to be intolerant but not a full blown Coeliac.
This article is based on similar conclusion. Over the years this has been increasingly accepted as the norm.