They know that their bread crumbs are a possible source of cross contamination due to being processed on shared equipment. They are purposely misrepresenting their product without that information. That makes it false advertising which is not allowed.
They are in fact targeting the portion of public who can be made extremely ill with this falsified information. It is a crime in the US to bait consumers into purchasing a product with falsified information.
I reported a company for such behavior. The government forced them to stop endangering people using the above argument . The law is flexible enough to protect people.
I thought they said shared facility not shared equipment. That is different, but still does not have to be labelled. Once again, if it is certified gluten-free, it has been tested for the presence of gluten.