That’s pretty inaccurate as well. Australia is diverse, but we don’t explicitly track ethnicities demographics so you’ll never find an official figure
To quote the wiki and ABS stats
Although the ABS does not collect data on race and ethnic background, various studies have put together results of the census to determine the ethnic composition of Australia, the Australian Human Rights Commission has estimated the European population at 76% of the Australian population,[20] while a media diversity study put it at 72%, the non-European proportion was 21% and 23% respectively, and the Aboriginal Australian population at 3% in both
So roughly 25%.
Add to that 30% of the population is born overseas (compared to 13% US), so 1/4 people you meet will be diverse in a non-skin identifiable way. And 50% of the country have at least one parent born overseas, so families are pretty diverse.
Fun fact, we’re also the only country in the world with a higher rate of Americans immigrating in than we are going to America.