Plovett
It must be pretty close to accurate, watch any of the tracks and they all take the same groove, just as the aircraft do.
If you zoom in and watch for the moment where the VBA stops (which we are sure it did not) the distance was around 3km, and the ATSB say 1.9nm so it is close enough for our discussion purposes.
Looks like the 767 gets an RA and descends from around 9700 to 9000'.
Maybe they busted an altitude.
Time will tell.