False advertising much?
If cat milk doesn’t come from cats, then don’t call it cat milk! Seriously, people, this isn’t rocket surgery! It’s called cow milk because it came from a cow! And guess where goat milk comes from? That’s right, a four-legged creature with stubby horns, a.k.a. a goat.
Also, if there’s a picture of a cat on a product, your first thought wouldn’t be that it comes from cats. Most of us would assume that the product is made for cats. We imagine this supermarket’s manager actually had to explain this to someone who was searching for milk from a cat. Some people are just weird like that.