I agree. It was uncalled for and to be blunt, protectionism.
If it can be shown that there is no safety problem with PPLs (of a certain experience level) in comparison the mint CPLs, both with the appropriate instructor rating, teaching other PPLs, then to say what Doc said is the sort of unionism we criticise ATC for.
The world does not owe CPLs a living, they have to be better than the competition inside the 'QANTAS' recruiting system so why is this different.