All of that may be true, but I think doesn't address the claims of the article.
The article says " Alexandria Ocasio-Cortez ... said, “The world is going to end in 12 years if we don't address climate change.” " That's unscientific claim by Cortez. I think the point that exaggeration undermines your credibility is an important fact.
I believe that those of us who push a cause so hard that we lose sight of facts actually hurt the cause, because we alienate all the objective-truth-seekers.