The Voyager on the Civilian Aircraft Register is apparently not grounded. That is the one that does the twice weekly airbridge BZZ to ASI and MPN. What is the difference? Refuelling pods?
The answer to that surely depends on how cynical you want to be?
The Mil registered ac have different software to include AAR calculations, so it could be particular to those ac.
If Airbus Mil ground the G-reg fleet as well, then that's a tacit admission of a wider problem (Quantas QF72?) and your share price takes a hit...you choose