No, it isn't nonsense. Neither are the signs at a mechanic's shop telling you they're not responsible for lost or damaged items. What all these signs have in common is that they signify dangerous work.
A dump truck can't be unloaded without everything else out of the way, a car on a lift should be treated with caution, and of course a rational statement of fact cannot be sugarcoated or censored without affecting its truthfulness.
Particularly with software, it can absolutely be dangerous to not be as clear as possible what is occurring. Computers are machinery too and humans should respect that.