I enjoyed your examination of the shifting meaning of overshoot. However, this morphing of language and what's being discussed is an old feature of the "Climate Science" conversation.

Back in the early/mid 90's when Global Warming was discussed it was usually in terms of how much TOTAL WARMING would be caused. I remember watching a Japanese documentary on fighting warming, where the triumph of the fictional scenario was when sensors indicated a DROP in deep ocean warming (around 2115).

Meaning warming had peaked and the planet would cool down over the next 200 years of the the project.

Fighting Global Warming was seen as a multi-century planetary project at that time. Then the debate shifted to just talking about HOW MUCH warming would there be by 2100.

These aren't the same things at ALL. But in the public mind they are. People overwhelmingly think that 2100 will be "peak" warming.

Since the late 90/s there has been an "assumption" built into the Assessment Reports that after 2100 a program of CO2 draw-down would happen. That the FUTURE, which would have better tech and more resources, would clean up the mess we were leaving them.

What's happening is that it/s becoming clear THE FUTURE IS NOW.