I’m lucky to not have any allergies, but my understanding was that any hidden nuts could potentially be life-threatening so you were supposed to just avoid anything that might have nuts, no matter how remote the possibility?
It’s interesting though… if we look to the v3 discussion the fish warning has been explained as being something they had to add even though there’s almost certainly no fish present.
So on the one hand there’s clearly a thing around nuts that mean the warning is needed whilst we’re told there’s nothing to worry about with fish.