Great job Kharon!
So in your post you essentially accuse these crew of :
Being irresponsible for rellying on BOM TAF and METAR information in deciding their fuel uplift.
You accuse them of not using common sense and uplifting more gas for mum as you put it. You insinuate that that was a careless shortcoming of both crew.
You offer up your wisdom and outline their options without being there.
As far as i can tell they both had fuel to divert their aircraft which is what they did.
Hell who needs the ATSB
This guy has answered all the questions.