"Not the only cause".....? The first 'cause' without which the chain could not be continued is what's known as the 'procuring cause'. The authorities including Airbus and Air France are playing with language, in my opinion.
Technically they are not incorrect, but they are suggesting that there may have been more than one cause. There can be a combination of events that exacerbate or accelerate outcome, but the pitots are in the 'hot' seat for now. Is it possible for the crash to have happened if the pitots had functioned properly? The answer is yes, but demands accepting coincidental events at long odds.
AB is calling for replacement of Thales (both types? but only two instead of all three). Two questions.
1. Where was their 'request' when the pilots 'demanded' it?
2. Why only two? Not all three? Taking a chance, aren't they?
If the remaining Thales fails, and...........
Since the sampling system uses pairs, only one good pair is left, G-G.
This is a singly redundant system.