Yes, I have read their web page concerning this because I did not want to eat chocolate that had milk in it as an ingredient and G&B list it as an ingredient. I'm not allergic to milk. I just thought it strange that dark chocolate would have milk as an ingredient and so I looked into it. They explain very clearly that they only list it as an ingredient because of the trace amounts that get into the chocolate from previous milk chocolate batches made on the same line.
It is hard for me to imagine that anyone could be that allergic to small traces of milk but then I haven’t any knowledge in this regard as milk allergies don’t concern me. It would seem to me that if you were that allergic to milk that you would find it hard to trust eating most things that you did not cook yourself in case someone failed to mention something they did not understand to be so important to such an individual.