A new study has found that much of the world will face uninhabitable temperatures if we continue on the current course of climate change as situation grows more dire
The bounds are subject to important limitations. Most importantly, they only apply to extinction risks that have either remained constant or declined over human history. Our 200 kyr track record of survival cannot rule out much higher extinction probabilities from modern sources such as nuclear weapons or anthropogenic climate change.
https://www.nature.com/articles/s41598-019-47540-7
Don’t miss this bit:
Oh sweetheart.
Did you google “human extinction science” and link the first result without reading it?
The part you quoted just says modern extinction risks are out of scope for this study.
It does not say that extinction is probable or likely.