I read it too. I’m particularly concerned about the ADIRU failure not being able to be replicated. that means either the hardware or software doesn’t have the right hooks in it for debugging. That means it’s a bad design that cannot be fixed, which is what I think Qantas must have concluded before replacing them.
BTW, Boeing is getting flak for still using an 80286 processor in the B737 FCC. I was told many years ago that they did this purely for hardware reliability reasons. I’m not sure what processor the failed ADIRU used, but leading edge processors have bugs that take years to discover.