There are still open questions of fact, like "Did they disregard a 'road-closed' sign?".
i'd say that Yes, they probably did. most outback councils are pretty good at getting their Road Closed signs out when it starts raining.
Also, most dirt tracks of that nature are clearly signposted that they should be avoided soon after rain. heck, ANY DIRT ROAD in Australia should be avoided soon after rain. two reasons, 1: you might get stuck and 2: you'll rip up the road and leave it all cut up, corrugated and rough until it rains again.
in any event, i'll come back to a point i made earlier: whenever you're driving in outback Australia, it ALWAYS pays to have a chat with some locals BEFORE heading off onto any dirt roads.
even in the middle of a drought with no rain forcast for another month, you should ALWAYS stop in the nearest town and ask some questions about any dirt tracks you might be venturing onto.
staff at service stations, newsagents, visitor info centres and at truck stops are all people who are likely to know about any major dramas on the roads you plan to take.
i live in Outback Australia and I am
forever pulling over to ask about road conditions if i'm planning a "short cut" down a dirt track.
edit: the Australian taxpayer shells out some impressive amounts of cash every year for various Search And Rescue operations. Not all of these are inland rescues either. For example, the Australian Navy plucking solo round-the-world sailors Tony Bullimore (UK), Abby Sunderland (USA) and Isabelle Autissier (France, we rescued her
twice!) out of the Southern Ocean were all expensive operations. For Land Search duties, we have the State Emergency Services backed up by the armed forces.
not only are we one of the largest countries by land area in the world, we're also responsible for SAR operations across something like 1/6th of the worlds oceans. as a nation we're simply not rich enough to be able to help every idiot who failed to help themselves. in situations like this one, i rekon it was perfectly fair for the Australian authorities to tell these brits to either pay up for their rescue or get themselves out of their predicament.
if it had been life or death emergency, i'm sure a food drop via helicopter could have been arranged.