The Wikipedia article [1] on the crisis has a whole lot of context that this clearly one-sided article neglected to go into. Needless to say, CIA involvement is a speculation and memoirs/papers released since 2014 have not strengthened the case for it.
The movie "The Falcon and the Snowman" was a dramatization of a real event where a Snowden-like figure sold secrets to the Russians after reading the secret telexes when the CIA was trying to roll the Aussie government
It's worth noting that there is mounting evidence that John Kerr, governor-general (and thus the Queen's representative) at the time of the dismissal of the Australian government in 1975, was a CIA asset:
"'The Palace Letters' show Sir John Kerr sacked Gough Whitlam because the embattled PM had taken on the US Intelligence establishment"
[1] https://en.wikipedia.org/wiki/1975_Australian_constitutional...