I feel like these kinds of statements are not very helpful. Knowing that even a single drop of alcohol is harmful without calibrating that risk does not give me enough information to alter my behavior. Fermented foods are inherently a bit alcoholic; does eating them mean I'm doomed? If not, then at what point does imbibing alcohol turn into a real health hazard? What are the risks compared to, say, eating prosciutto or grilled meats?