"Milk" has been a generic term ever since coconut milk has existed. Heck, Wiktionary even cites 14th and 15th century uses of the term "almond milk". [1] Not

"Milk" has been a generic term ever since coconut milk has existed. Heck, Wiktionary even cites 14th and 15th century uses of the term "almond milk". [1] Not to mention "milk of magnesia", which isn't even a foodstuff. Just because you personally have not heard the non-dairy sense used until recently does not mean it is incorrect or should be "illegal" as the GP suggests. [1] https://en.m.wiktionary.org/wiki/milk https://en.m.wiktionary.org/wiki/milk