1 - If a product contains one of the main known allergens like dairy or soy, are they required to include a bold "contains [allergen]" disclaimer even if the allergen is clearly written in the ingredient list?

See an example of the ingredient list on the back of this package that contains hydrolyzed soy protein and whey protein/ dairy but only states May contain sulfites in bold at the bottom and disregards the other allergens.

2 - if someone with a severe allergy consumed said product and gets sick or has to go to the ER for treatment, would they have any legal standing to sue the manufacturer or supermarket that sold the product?

Thank you!