Nigel:
First of all, AIRSPEED UNRELIABLE may only be, indeed probably is, "crew assessed" not aircraft (if the aircraft assesses it it will "deal" with it).
Well there was certainly an ADR DISAGREE... but I think you're right, thinking back to earlier discussion perhaps there isn't a specific ECAM for AIRSPEED UNRELIABLE - but the system knew there was a problem.
Knocking off AoA interpretation below 60K IAS seems valid enough to me - and also at that sort of airspeed you are not just "stalled" in the normal sense of the word - you are a falling leaf
Yes absolutely, the last thing you want is nuisance stall warnings, I couldn't agree more - when you have *reliable* data. But please, if there's any serious dubiety about the data, I would doubt the wisdom of shutting off the stall warning based on IAS data that's known to be dubious...