It is simple.
More CO2 means rising temperature.
1.5 is already unfolding in multiple crises
We have agreement that we are not meeting goals.
The current direction is increased energy use, not declining.
Temperature will continue to rise.
=========
language like "Temperature rise by 2400 will be..” usually does not discuss what the temperature will be past 2401, 2401, 2402…
___________
To test yourself try analyzing the thinking from this Pre- COP 28 meeting a month ago.
For example, they propose solving steel production by using hydrogen-produced electricity without mentioning that we way we produce hydrogen is by burning fossil fuels, and the tech for hydrogen production at scale does not exist.
They meet every shortfall wth "wemust.”