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.
But that line of thinking will let some people believe we’re good until we hit that 4° mark. I have no idea how likely some of the tipping points are (AMOC collapse, West Antarctic glacier loss, permafrost melt and methane release) but they sound apocalyptic and much more likely as we increase climate change