Sorry for the late reply
The coolent in the throttle body is to stop it freezing when in sub zero deg temps!!
I am talking about -10 and colder!!
So it is NOT required in Australia!!
Just for example
The lowest temperature ever observed in Japan was -41 degrees Celsius (-42 degrees Fahrenheit), recorded in Asahikawa in January, 1902.
Keep in mind that the intake temps on a (street aka no ice boxers) turbocharged car are normally between 10 to 20 deg hotter than the air temp (depending on setup)