You understand that the product I'm talking about is the same proteins as milk, and is essentially whey, right?
I'm not talking about grinding up nuts or grains and calling it milk, I'm talking about engineering yeasts to literally produce the proteins that milk has to create a product that isn't just milk-like, but is literally identical proteins.
Whey is just a small part of milk, though. You can't isolate one aspect and pretend it's fair to call it (cow) milk.
You wouldn't call whey protein powder mixed in water milk.
You wouldn't call butter mixed with water milk.
You wouldn't call casein powder mixed with water milk.