I saw that program too. 4 corners on the ABC. Just about made me cry.

I couldn't believe that anyone would go up into a roof space with highly conductive aluminium foil, and then start spreading it around and firing off metal staples through the stuff, without turning off the mains power at the switchboard.

It made me very angry, mostly with the people who set up businesses to make a fast buck at the taxpayers expense without any apparent concern regarding the safety of the people they employed to do the job, and without any regard for the safety of the finished job for the householder.
It looked like a classic case of get in, do a rough enough job, get out, and give me the money.
I think they are mostly to blame for the deaths and the rough and unsafe workmanship.
The government is partly to blame for being so stupid as to not expect that if they put a bucket of money up for grabs, then it would attract a whole lot of 'fly by night' operators just in it for some easy money.
They made the same mistake with their schools building program.
It shows how disconnected they are from the real world.
They were also at fault for being so slow to take action when they were advised of the obvious faults in the program.
As general advice, anyone going up into the roofspace should turn off the main power switch at the switchboard.
This applies particularly to old houses because;
1/. even if it had good wiring to begin with, rats love to chew on plasic insulation and will chew it right down to the copper wires, leaving live wires exposed.
2/. If the house is pre 1955, it would have the old rubber insulation which by now is competely rotten and falling off the wires. There will be many live wires exposed.!
I think the only reason you would need to pull the fuse at the power pole is if you were working at the point where the overhead wires entererd the house and then went off to the switchboard. I would be surprised if that was necessary.