If an A320 pilot really wants to he can simply switch off flight control computers until the aircraft goes into DIRECT LAW. In this case he would lose all protections.
Why is beyond me as there no advantage in being able to over stress the airframe.
No single computer failure will down grade the control laws it has to be multiple, and often a simple reset will restore normality.
There is a control mode which recognises an upset and will allow manoeuvres necessary to regain control which would normally be prevented.