I don't see it now but I could have sworn he said that the climate change article should have more information on how it is contested. Personally, I don't think that's reasonable because it wouldn't accurately summarize the state of knowledge and reputable sources around the subject.
I chafe as much as anyone about overly propagandist texts in Wikipedia (and I've deleted or edited a fair few) but the climate change article seems overall fine. It's not slanted or anything. I'm sure one could interpret "intellectual diversity" to include outright nonsense but I don't think there's much point to it. In any case, considering he has the Citizendium project and has only sporadically contributed to Wikipedia over the last two decades, I don't get why he's back here.
For some reason, back in 2025 he decided to archive his previous user page describing his resignation in 2002[1] and start this Wikiproject and do not much else.
I don't know, man. At some point, one no longer retains any authority as founder. The whole thing just seems like some kind of culture war nonsense.
1: https://en.wikipedia.org/w/index.php?title=User:Larry_Sanger...