This factors in some feedback loops which most sudies to date have ignored. Note, that it excludes extra warming caused by all the additional water vapour in the air.
For context, studies suggest that the largest extinction event in Earth's history (so far), the Late Permian Extinction Event, saw temperature rises of around 8°C.
We're basically on course for infinite warming. By the time anyone decides "maybe we should, like, seriously, try to fix this?", we'll be turning into Venus.