So most likely that is focused on hydronic heating systems. Personally at my local home improvement store all the fitting in the plumbing section are listed as

So most likely that is focused on hydronic heating systems. Personally at my local home improvement store all the fitting in the plumbing section are listed as potable/lead free. If you have some examples of fittings that you are referring to I would be interested. I can only really find hydronic circulator pumps that are only low lead instead of lead free.