I will ask this differently...
from the posts, it seems the string of events is
a/c slowed to penetration airspeed in severe/extreme turbulence
loss of pitot input due to icing
failure of ADIRU1 due to lack of input
disconnect of autopilot and reversion to ALT law (no stall protection)
failure of PRIM1 and SEC1 and ISIS
loss of control, possible stall
ACARS message about cabin pressure due to inflight breakup.
(no attribution!)