Hi,
This aircraft didn't fail. One system alone had what should have been a non earth shattering, temporary fault, due to ice crystals, but then it's pilot(s) failed.
I will repeat this X1000 if needed:
The Pitot tube was not faulty
As many here like write about the plane ...
The pitot tube operated normally .. as required by its specifications and certifications
The problem is that the measuring instrument has been used outside his operating range
Ice crystals is not a area for use Pitot tube .. it's not in the certifications
As the plane went well until he was out of its flight envelop
As the pilots went well .. until they were (or put their self) in a situation out of their skill