If you read more of the report it does say,
As the helicopter was being operated privately that day, and therefore there was no operations manual, hot refuelling should not have been conducted. In addition, the R44 pilot’s operating handbook required the pilot to remain at the controls while the helicopter was operating.
Unmonitored helicopter flight controls with the rotors running, such as during hot refuelling, increases the risk of the helicopter unintentionally becoming airborne and subsequent injury to bystanders.
The initial quote at the start of the thread was part of the summary and is what is now commonly known as 'click bait' designed to grab attention and not necessarily contain the full information.
The ATSB have made it quite clear that the pilot committed a number of errors and my opinion (2c) is that the comment about loss of control was to reinforce why the rule is there in the first place.
There was no witness to the hot refuelling, only the GPS data that showed the length of time that the aircraft was on the ground would not have allowed a proper shut down, refuel and restart in the time recorded.