Which STANEVAL would that be, presumably the VC-10 STANEVAL and not the C-130? I expect they thought the Victor crews were "bloody dangerous" too!!
STANEVALs can be wrong, and when they are they're all the more dangerous for it, because generally they'll never admit/accept the fact!
C-130s were tanking well before a HDU got anywhere near a VC-10, and doing a pretty fair job of it too. But let's not let any facts get in the way of a good story.