We must land off this approach could mean minimum fuel to land then go to an alternate airport but from the discussions re Pearce Gin Gin etc there is no way they had fuel to diverte to a suitable airfield by that stage. Its pretty much a given they landed on vapours, but Perth is a pain in the butt place for this kind of stuff to happen whether windhear or unforecast fog. At least with the fog you can autoland the thing in a last ditch attempt, strong easterlies are another beast entirely, either way I think it is a bit of a storm in a teacup really!