Come on Calvin, the document you provided is a training document for installers and reflects company policy. Those policies would be in place for the protection of the company not the purchasers.
It is not a law that is enforceable by a court of law. For the umpteenth time, quit this nonsense and provide the applicable law that requires one to install tires with load capacities that exceed the axle capacity.
On edit
If you would have read the entire document, it says farther down;
GAWR also applies to OE and replacement tires. According to Federal Motor Vehicle Safety Standard (FMVSS 571.120):
The sum of the maximum load ratings of the tires fitted to an axle shall not be less than the gross axle weight rating (GAWR) of the axle system as specified on the vehicle’s certification label (tire information placard).
Keith