Sometimes Musk does post a factual claim that's wrong in some way, specifically asks for a fact check, or posts something misleading, and then a CN does appear. Examples:
But why not sign up for a CN account like I did and go look. Last time I did this almost every tweet he posted had a gazillion proposed CNs but one of the rules that the community is good at enforcing is that a CN is not meant for just arguing with someone. Many of the proposed CNs on Musk's posts didn't meet the criteria to be a note and so they get meta-moderated out on the grounds of "no note needed" (NNN), which is the reason people pick when a tweet isn't making a factual claim to begin with.
Most of what Musk posts are either opinions or just retweets, and arguing with an opinion is always supposed to be marked as NNN. And CNs go on the original tweet not retweets.
https://x.com/elonmusk/status/1876435054622388257 (from yesterday)
https://x.com/elonmusk/status/1876554867785007175
But why not sign up for a CN account like I did and go look. Last time I did this almost every tweet he posted had a gazillion proposed CNs but one of the rules that the community is good at enforcing is that a CN is not meant for just arguing with someone. Many of the proposed CNs on Musk's posts didn't meet the criteria to be a note and so they get meta-moderated out on the grounds of "no note needed" (NNN), which is the reason people pick when a tweet isn't making a factual claim to begin with.
Most of what Musk posts are either opinions or just retweets, and arguing with an opinion is always supposed to be marked as NNN. And CNs go on the original tweet not retweets.