well CSIRO are a better source than some guy you met in a bar or a US based website run by MAGA lunatics. And the get out clause only covers a 9 lines - by modern standards (check your car warranty) thats nuffin'.
" since national records began in 1910," = yes , there are records before 1910 but they're not standardised, the equipment was different, the observations were taken on different days at different times and sometimes not at all and there were very large areas where there were no records. I did a course years ago on weather observations and how careful you have to be to compare like with like. At one time local authorities in tourist towns in the UK used to place their daylight/sunshine kit on the highest point for miles to maximise the numbers so they could claim "we are the sunniest place in Dorset" etc. Oddly their rainfall gauges all seemed to be somewhat overhung by nearby buildings in a completely separate place.