Your argument is garbage, because in America the pristine data sets that are used for USCRN dataset show cooling.
https://www.ncdc.noaa.gov/temp-and-precip/national-temperature-index/time-series?datasets%5B%5D=uscrn¶meter=anom-tavg&time_scale=p12&begyear=2004&endyear=2019&month=12
The same thing would happen here if it was also done.
Temps in Sydney are much warmer than those in the suburbs and further out. Urban Heat Island adjustment is 0.1c as per Tom Karl 1984.
Clearly it's bigger than that, which is why USCRN shows a cooling trend at all the stations chosen that pristine and away from UHI contamination.
That is why UAH is the best dataset, it picks the whole lot up, warming and cooling, where as the UIHI affects minimum temps especially.
