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.
I think I do. So much in terms of doom and gloom is being shouted in terms of climate change that many are becoming numb to it, which is dangerous.
He is wrong about 1.5C not being an issue, however. 1.5C != “every place will raise only by 1.5C”. It means localized temperatures in many areas will be much, MUCH higher, as parts of the US are beginning to find out.
Responsible messaging is important, but the looming catastrophe cannot be understated. You or someone you know will likely die from global warming, if it hasn’t happened already.