Correct and the power parameters apply to all a/c. If a/s is lost refer to a known power setting and attitude.
Yes, but this may not work immediately in an aircraft with hard envelope protection which is suffering from erroneous inputs. It may be trying to follow a trajectory that is completely wrong for the situation and making it harder to recover by doing things like trimming the stabiliser in the opposite direction needed.
By the time this has been diagnosed by the crew, probably during a time of very high workload in the middle of an upset, it leaves little time for remedial action. “Known power setting and attitude” will not recover the aircraft from a stalled condition. Much more aggressive inputs are required.