The OP is asking about the Gen4 bikes, not earlier gens. Ans specifically about the Aussie Gen4 whether it is indeed top speed restricted.
I have read that it is still around the 190mph top speed restricted inside ECU working off the wheel speed sensors. So a reflash is needed to do away with the Aussie/Euro speed limiter inside ECU which is acually 3 things, the speed limiter itself, the secondary throttle bodies closing near redline and the intake ram air flap closing near redline for you over seas guys.

ccasion1
Garth here in states has broken 200mph but could not at first until the true speed limiter in ECU was removed. Simply flashing the Euro/Aussie map into the ECU, which was the very first flashes done here, did not allow bike to exceed 190mph. Though they did make more power. There is a thread with a response from Guhl, DT, and the magazine top speed test they did and how the bike failed to break over 190mph because of the hidden code in ECU to allow the Gen4 to keep going.