Using the brakes is what removes rust from them. The friction of the brake pads rubs off the surface oxidation. I would expect Teslas to have very rusty brake

Using the brakes is what removes rust from them. The friction of the brake pads rubs off the surface oxidation. I would expect Teslas to have very rusty brake rotors unless they have something like BMW's brake drying to cycle the brakes regularly to remove rust. I have no idea what it means to "lube" brakes, I guess you mean where the calipers mount? I have never heard of that being a maintenance item. But please do not apply any lubricant to your braking system unless you know exactly what you are doing and why. I am speaking about water vapor getting inside the braking system, which is unavoidable. Eventually moisture will get in there and it will settle at the bottom of the system where it will begin to rust components from the inside.