I would also suggest more caution in your final statement - you cannot know that if the airspeed systems functioned flawlessly then the accident wouldn't have happened. You can only surmise.
Respectfully disagree. That was the second hole in the swiss cheese. The first was flying too close to a CB cell.
I know that if the aircraft had not lost airspeed reference, we would be looking at a very different accident at worst, and probability says strongly that the aircraft would have arrived in Paris.