Since you provided no link, I’m going to wing in based on memory. Let’s see now, did Mann come out of the blue & admit he screwed up? Or were his damning emails, including “hide the decline” leaked, forcing the admission of which you speak? I’m remembering ‘B’; how do you remember it?
Basically he says that climate models cannot account for observed past climate change. He actually stops just short of the key admission. My bad, but I would never hold out Michael Mann as an exemplar of a good scientist in any case.
There are other, better, examples of former warmists who have had the scales removed from their eyes. I just don’t want to take the time to dig them out on behalf of someone who wouldn’t be grateful. - not you.