In short, we aren't on track to an apocalyptic extinction, and the new head is concerned that rhetoric that we are is making people apathetic and paralyzes them from making beneficial actions.
He makes it clear too that this doesn't mean things are perfectly fine. The world is becoming and will be more dangerous with respect to climate. We're going to still have serious problems to deal with. The problems just aren't insurmountable and extinction level.
honestly i've delt with more people who refuse to change anything because "what's the point" than I deal with outright deniers anymore.
But most of the people who express that opinion aren't saying it because they think that climate change is unstoppable.
They are saying it because the changes that we know can help fight climate change, that we've known about for years, that international leaders can implement, aren't being done.
And this statement, from someone with a lot influence on global carbon emissions than the average person, seems very out of touch. He is telling off the people whose house is burning down, while ignoring the arsonists.