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And almonds don't lactate. Do you call almond milk "almond-flavoured water"?

There's a reason people use existing "technically incorrect" product names to refer to replacement products like this. It's so people who are used to consuming the original products see the replacement as a replacement, on level footing with the original.

Almost no one is going to replace dairy milk with soy bean-flavoured water, and chicken patties with chicken-flavoured burgers. The latter sound like dodgy knock-offs and people don't want to put that kind of thing in their bodies.

Also, "chicken-flavored burger" isn't really accurate to what this is. It may be lab-grown, but it's still meat. A "chicken-flavored burger" sounds like a vegetarian patty with chicken-like seasoning and flavours.