I think he thinks that the zero point was crossed long before 1900, but I’m not sure.
I think the phrase “10,000 years of misery” is perfectly consistent with believing that the changes were net good due to population growth, and “misery” is pretty much equivalent to “average quality of life”.
Holden Karnofsky has written some about average quality of life, including talking about that chart.
https://www.cold-takes.com/has-life-gotten-better/
I think he thinks that the zero point was crossed long before 1900, but I’m not sure.
I think the phrase “10,000 years of misery” is perfectly consistent with believing that the changes were net good due to population growth, and “misery” is pretty much equivalent to “average quality of life”.