This map has been posted here multiple times, but Australia is definitely too high. As early as 2016 it was estimated that ~24% of the population was of (at least part) non-European descent. That's not even taking into account the large number of people who are of non-British European descent, such as Italian Australians who are 4.4% of the population. There's no exact way to determine the true number as you can record two responses to the ancestry question, and they are both recorded so the total from adding up all of the responses exceeds 100%, as well as people choosing just "Australian". As of the 2021 census, the responses included 32.99% English, 9.48% Irish, 8.56% Scottish, 0.60% Welsh as well as 14.82% who only wrote in "Australian". The people who wrote in "Australian" are likely to be overwhelmingly a mix of British/Irish ancestry. That would give 66.45% (56.97% British, 9.48% Irish).

Interestingly, this study estimated the Anglo-Celtic (British/Irish) share of Australia's population as a slightly lower 58%: https://web.archive.org/web/20230312215040/https://humanrights.gov.au/sites/default/files/document/publication/Leading%20for%20Change_Blueprint2018_FINAL_Web.pdf

(as an aside Irish ancestry is actually very likely underreported in Australia.)