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.