What is not understandable here? Crypto is all about decentralization, Community Notes embodies that value (obviously not ideally, because Twitter still can decide to do whatever).
Community Notes is an interesting example of collective moderation, but it’s an example of collective moderation, a long-standing thing that has nothing to do with decentralization as I think most people understand the term. The objection here, I think, isn’t to Vitalik’s interest in it — it’s to the “if all you have is a cryptocoin, everything looks a blockchain” mindset.
It's not. I should have added more examples. Another one - how do you arrive at a single truth?