No, I fully understand their nonsensical argument and my comment was constructive, although with a less serious approach. Things are called by whatever is convenient. If something is intended as a meat/dairy substitute, it is perfectly natural to draw similarity to the thing it is replacing. Nobody is going to call it "oats soaked in water and then blended to a consistency and taste that you can use in your tea". It's just oat milk.
Hey you're passionate about the topic, fine with me.
Oat/Soy/Almond milk in most cases is a sugary flavored drink with a little less sugar than a soft drink. It's marketed with dubious health claims as a substitute, including paid placement on dairy shelves to imply that it is in fact a dairy product.
We call Coffeemate "non dairy creamer", Yoohoo a "chocolate flavored drink", SunnyD "orange drink", cut-up whitefish with red dye "imitation crab". Why should oat water be any different? Why is it important for the private equity people who own Oatly, or the Diamond Nuts people who own Califa, or Coke and Pepsi to market nut/oat based products as milk?