[jpablo]

Well the actual paper he's basing all of this is here:

https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/202...

The authors of the paper suggest a +0.15 Wm−2 radiative forcing and give the radiative forcing increase due to CO2 form 1996 to 2005 as +0.26 Wm−2.

This seems to provide an explanation of a huge jump in temperatures non expected by current CO2-only models.

Why this effect would not have been seen in the summer of 2022 I don't know, nor seems the authors of the paper or the liked article address it.

Also the author says this effect may dissipate in 5-10 years at which point the expected warming from CO2 would "match" the current temperatures anyway so there's no real 'cooling' to be expected.