They had valid Australian licenses which had not been fully validated for the SA registered aircraft. A paperwork issue.
Knowing that they were both (clearly) trained on type, you are focusing on easily the most irrelevant and insignificant aspect of this tragedy, paperwork on the day wouldn't have stopped what happened from happened. For what purpose or agenda remains to be seen.
I don't think anyone here is really over-exercised about the paperwork - licenses, validations, certificates... we know these guys could fly the plane, and we know they know that their careers depend on them following the rules of Air Law.
I am not too much bothered about the paperwork shortcomings as I don't think it had much of an impact on the final outcome.
None of you maybe concerned about the paperwork but the lawyers and insurance companies sure are ...