ACDC - the MfS is right I think...
What he's saying is that in the original post, the aircraft is a different weight in both scenarios, but the same IAS. Because of this, it must be true that the AoA is different in both scenarios.
Hence, the warner will operate at a different IAS dependent upon weight, even though it is at the same AoA when it operates. OK, no it doesn't 'know' the weight of the aircraft, but you could surmise whether the aircraft is heavier or lighter based upon the IAS at which the warner operates.
Somebody correct me if that's rot, long day.