Whilst common sense may support that suggestion, I wouldn't place to much faith on it in a law court. An analogy could be a "Beware of dangerous dog" sign on the front gate. Whilst it gives a warning, it is also an acknowledgement that you have a dog that is potentially dangerous. So if it bites somebody, guess what........
The piece pf paper may provide some protection to CASA, which is more than likely why they require it.