andrewr. You are obviously trying to be logical. Whilst logical thinking is not prohibited in the CARs, it is prohibited in the hallowed CASA halls of power.
Some years ago CASA successfully prosecuted a diesel fitter who flew himself to station properties, carrying his tool box, in his privately owned Cessna and on a PPL. They contended he required a CPL and an Aerial Work AOC.
If you feel you understand CAR206 and particularly 206 (1) (b) and (c) perhaps you could give a definition of the terms "fixed terminals" and "specific routes"?