Sooo - if it's true, great, one problem less! Regardless, there are still many other problems caused by climate change that he did not dispute and that we still have to fight. So the best course forward is still to reduce emissions, and keep an eye on the reef to see what's true.
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Googling around I found the statement that
“Dr Ridd was not sacked because of his scientific views. Dr Ridd was never gagged or silenced about his scientific views, a matter which was admitted during the court hearing.” [0]
(But if that's true or not.. hard to say from here. The court recordings would have evidence.)
[0] https://www.theguardian.com/environment/2019/apr/16/james-co...
He's just a person with an opinion not a dissenting scientist.
And if his work suffered as a result of voicing such opinion then it was only to be expected.
If you voice stupid opinion regarding domain you know almost nothing about and prop it up with your work reputation it's only fair if that reputation takes a hit.
You might as well consider every philosopher an authority on everything because every problem ever solved was solved by thinking and that's what philosophers do. While in reality philosophers are only authorities on (the history of?) philosophy.
Some philosophers follow logic but apply it to unanswerable questions. Some can't even do the logic part rigorously enough. Personally I have no respect for this field of culture and humans that pursue it. All of them are not even wrong.
"Among the most-cited is a 2013 study of nearly 12,000 abstracts of peer-reviewed papers on climate science published since 1990, of which just over 4,000 papers expressed an opinion on the cause of recent global warming. Of these, 97% agree, explicitly or implicitly, that global warming is happening and is human-caused."