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The article Forgotten history: 50 degrees everywhere, right across Australia in the 1800s claims that there were regular recorded temperatures above 50°C across Australia in the 1800s:

Australians have been recording temperatures of over 50C since 1828,
right across the country. In 1896 the heat was so bad for weeks that
people fled on emergency trains to escape the inland heat. Millions of
birds fell from the sky in 1932 due to the savage hot spell.

Is this true?

True, but Misleading

Temperatures over 50 were routinely measured in Australia in the 19th century, but it was due to the fact that Australia hadn't modernized its weather technology until 1910, which is when "official" Australian heat records begin.

The pre-1910 data have not been “wiped from the record”. They are still available on the Bureau’s website, but are not included in the official record because they cannot be compared easily with modern data. http://theconversation.com/factcheck-was-the-1896-heatwave-wiped-from-the-record-33742

and

The year 1829 stands out as particularly warm. Although the temperature observations are to be treated with caution...Although the development of this dataset represents a significant advance in historical climatology in the Australasian region, there are unavoidable limitations that must be considered. Observer biases and remaining inhomogeneities mean that the observations are of poorer quality than modern meteorological records, and they should be interpreted with caution. Particular care must be taken with the temperature observations, which are especially sensitive to changes in exposure, and monthly rainfall totals, which have not been examined for undercount biases https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/gdj3.19

In short, don't take Australian temperature recordings prior to 1910 at face value.