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Unless in possession of a crystal ball, nobody can say what is bound to happen to our species as climate changes take place.
Like any other species we are vulnerable to extinction but as many physicist have underlined, the highest risk for a civilization is its start. After a certain point is achieved, a civilization can become technically immortal.
What qualifies a physicist to discuss the immortality of a civilization?
Here, indulge.
An per your question: the same that qualifies you or me, which is being alive and capable of observe and extrapolate possible outcomes through thinking.
Then why are we taking their opinion over our own?
Typically, when people cite something like that, they defer to an expert in that field. In this case, maybe an anthropologist? There's nothing in the training to be a physicist that prepares them to understand the early stages of civilizations forming, let alone is longevity.
Have you read the article?