1. Is it really safe to assume that all three pitot tubes were giving false readings? All three might disagree - but that would also be true, would it not, if only two were giving false readings and the third was still functioning normally in all respects? In the event it probably does not matter, since the computers are going to report a three-way disagreement and toss it to the pilots in either case...I just caution against stating flatly that all three pitots failed. We don't know that.
We could ask a simpler question: Does the code 34111506 in the ACARS message set mean that there wasn't a valid airspeed reading/value availabe ?