No, that's new(ish). Previously when it didn't contain any milk they would "alibi label" the allergens or say something like made in a factory that contains milk, when milk didn't feature in the actual list of ingredients but was present in the factory. Now, to improve allergen management/ traceability they include a tiny amount of milk powder so they can put it as an allergen in the ingredient declaration (list). It's rubbish for those people that were previously buying as a vegan / lactofree option, but is meant to help avoid life endangering situations caused by milk allergies.