I realise it’s impossible to imagine but some engineers actually hold a pilot’s licence. Perhaps the unfortunate person involved in this incident, did.
As for moving it before the AAIB visited - they may well have given permission for it to be moved and are more than likely not going to travel to Perth to see the helicopter anyway.
Who knows....?
PS Re the ARC bring expired. Not important for a ground run but even if the ARC had been renewed, G-INFO wouldn’t show the updated info until the following midnight when the system updates.