Joseph, the concept of a "reasonable person" doesn't work here.
To a reasonable person with no light aircraft piloting experience a stall may indeed be "aerobatic" in the sense that, to him, he imagines it to be life threatening.
If you mean a "reasonable pilot" CASA, the AAT and the Courts destroyed that concept many years ago.
What concerns me, as it should concern you, is CASA's attempt to restrict manoeuvring within the manufacturers existing stated flight envelope.
My opinion of that action is that, if it is allowed to stand, will eventually result in CASA proscribing all flight except straight and level, the gentlest of turns and any speed above the green arc.