He had 28 total time in a C210.
My bad Dick!
I read your post as,
"Prime cause of the accident - RAAF imposed flight planning restrictions that force low time pilots away from the safer low level coastal more direct route and towards the mountains which forced a climb into icing conditions.."
when I should have been obvious to me that you meant,
"Prime cause of the accident - RAAF imposed flight planning restrictions that force low time on an aircraft type, experienced pilots away from the safer low level coastal more direct route and towards the mountains which forced a climb into icing conditions.." 
So if the pilot had more experience on the C210 this accident would not have happened? Is that what you are trying to say?