Prior to that earlier incident in Victoria one of my friends visited a flying school somewhere in Australia to do a bit of dual flying in a Bristell and was particularly interested in seeing its stall behaviour .... "oh noo we don't do stalls in that aeroplane" .... no reason given.
If an aeroplane is not approved for intentional spins then I'd be very wary of "advanced" stall exercises with a student.
With CASA's new unique non-ICAO definition of aerobatics my opinion is that an instructor would require a spin training endorsement in order to teach the advanced stall exercises of the new Part 61 and use an aeroplane which is approved for intentional spins. I will put that to CASA at one of their upcoming Flight Instructor Safety Workshops.