No, that is not the problem at all. There's no allegation of improper labelling. Rather, the problem instead is that the law regulating proper labelling leaves

No, that is not the problem at all. There's no allegation of improper labelling. Rather, the problem instead is that the law regulating proper labelling leaves those with sesame allergy worse off, because it incentivises adding small amounts of sesame flour, labelling the product as "contains sesame" and being done with it. There's nothing wrong or improper with doing that - your labels are all correct, the law is followed.