It does not sound like a subtle signal or warning about crossing a threshold, more like a we are already past the point of no return and now we can just sit back and watch as the apocalypse unfolds, first row seats for all recent generations.
Some things are set in motion. But it's not clear if we have reached a state yet, where climate change will reinforce itself indefinitely.
Staying below 1.5 degrees global warming is very unlikely at this point. But every tenth of a degree counts. Humanity needs to be decisive in slowing down climate change. This is a matter of political will.