Amos, read what I said.
The fuel they departed with was NOT the burnoff fuel. They departed with the correct fuel order, except that it was the correct fuel order for the sector they had just completed, Syd-Akl. That was the error and that was the reason it wasn't picked up until after departure.
There were reasons for it (there always is), but it was an error nevertheless.
Kaptin M, that story was a 747 and like other stories, there was a lot more to it than what you just mentioned.