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.

Community notes launched at the start of 2021. It predates the buyout by almost two years.

If what they said about their design is to be believed, political downvoting shouldn't heavily impact them. I wish it was easier to see pending notes on a post though.

The bad faith “NNN - just expressing an opinion” is a cancer on CNs too.

To be fair, a lot (not all) of notes on Musk's posts are spurious, including the NNN's. It's clearly being misused there, but in general they seem to work very well indeed.