Airbus use a 100 kt call ( its not just for IAS crosscheck either ) BUT most of us check quite a few times the IAS is alive, especially looking for expected acceleration with a nice long trend vector...most of us if not all of us should notice no IAS way before 100 kts. Even at 100 kts there is still ample time to notice the discrepancy and STOP before V1
I would venture to suggest that they must have had some IAS indications that changed after airborne, perhaps as posted above the covers melted and then blocked after airborne?
I would be very surprised if a current professional crew got airborne without any airspeed indications at all.....