Yes HC i would agree with the comments around operation otherwise one would have expected some caution around that?? However it does seem rather odd that not a single other machine even displayed a cracked shaft beyond the accident machines, and perhaps it is in fact the specific nature that is causing the real issue.
If minute 15:21 to 17:00 is any indication (in the video below) then of course one might suggest that a specific version of FADEC, in specific conditions, would fall into the operation category, especially if it relates to this:-
EASA Airworthiness Directives Publishing Tool
100K hours of which CHCN looks to have been the fleet leader at 3845hrs....