I am not so sure that Musk or right-wing moderators are directly to blame for the lack of published community notes. My guess: in recent months, many people (e.g., me) who are motivated to counter fake news have left Twitter for other platforms. Thus, proposed CNs are seen and upvoted by fewer people, resulting in fewer of them being shown to the public. Also, I ask myself: why should I spend time verifying or writing CNs when it does not matter - the emperor knows that he is not wearing any clothes, and he does not care.