It says in one of the previous paragraphs it's an update of Forster et al. climate indicators. I recall in there that they use three methods to define human contribution following AR6. But yeah, it's a bit vague....
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What extra information needed to do the attn update? Changes in models used? Where did the forcing estimate updates come from... are they documented? What do the uncertainties represent in % and are they the same as the other values in the graph? Was obs used same as shown in graph? ...
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https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter07_SM.pdf
https://github.com/ClimateIndicator/forcing-timeseries/tree/main