This is sort of along the lines in which labels advise that "this product was produced in a facility that processes peanuts, tree nuts" etc.  The product itself may not contain those potential allergens, but may have come into contact with allergen residues.

Such labels are therefore of limited value to the consumer - especially if they have strong allergic reactions - but are of value to the producer in terms of limiting product liability lawsuits. By the way, speaking of allergies:

If you’re one of the 3.6 million people with an EpiPen prescription, you probably paid way too much for it—if you could afford it at all. That’s because, since buying the rights to the device nine years ago, the pharmaceutical company Mylan has pushed a relentless series of price hikes that has seen the cost of the device go from an average of about $50 in 2004 to more than $300 each today.

Those ads pushing EpiPen don't come cheap....