Interesting discussion on the fuelling. I note that you have naturally characterised it the way we interpret it.
We, as engineers do not and are not required to supervise the refuelling during transits.
The reference here is about the refuelling not the refueller so your words relate to the task not the person. Simple question that goes back to the manuals. Who supervises the refuelling if there is a defect in the refuelling system?