http://thefederalist.com/2018/07/30/fda-thinks-youre-stupid-know-almonds-dont-really-make-milk/
Probably what the regulation demands and it makes sense in the abstract but it is unnecessary.
What shouldn’t be classified as dairy is anything skim or fat free.
If a country can accept cars running on “gas”, they can accept almonds producing “milk” 😉.