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by amateurCoder5 1051 days ago
The climatic optimum you refer to was cooler than today. From the wiki you reference:

A study in 2020 estimated that the average global temperature during the warmest 200 year period of the HCO, around 6,500 years ago, was around 0.7 °C warmer than the mean for nineteenth century AD, immediately before the Industrial Revolution, and 0.3 °C cooler than the average for 2011-2019.