Southernboy, BUSHJEPPY;
The problem with blacklists is that to get on one the airline has to be Dire. Nowadays audits produce little real inside information about company culture, which is arguably more important that how they do their paperwork
Like the SB and AD processes themselves, the "IOSA Audit" process accomodates politics and economics; whether that is a good thing or not depends upon one's priorities. From the point of view of some flight safety specialists, the IOSA process is somewhat questionable and, like SMS, is focussed on process and documentation and not "what actually is", at an airline. Much can be papered over and otherwise ticked off as done but still not be effective or excused, on the promise that it will be done at some point. Seen it.
Whether that is the case here remains to be examined, (if at all). With statements such as we have heard signaling official reasons "why the accident" by high-ranking corporate and/or political leaders, the chances of a full investigation diminish.