Your understanding was wrong. AIP comm section applies and is quite clear. I'll let you practice reading it yourself
Well not really bright spark
JEPP AU-811 5.2.2.8 states;
For aircraft in the SUPER or HEAVY wake turbulance categories, the word "SUPER" or "HEAVY" respectively must be included immeadiately after the aircraft call sign in the initial radiotelephony contact between such aircraft and the aerodrome
control tower or the
approach control unit.