My bet for the real reason for this is that it has been widely reported that Twitter artificially boosts Elon's account specifically. Many people noticed when they did this that his posts showed up in their feeds despite them not following his account. I bet this led to a massive wave of people blocking his account (it's as easy to block as it is to mute). And this population of users eventually got big enough for him to notice, and he wants his posts in everyone's feeds again.
Elon is not getting an artificial boost. The people reporting about Elon's posts being artificially boosted either don't know how X's features work or they are engagement-farming for clicks.
X has two user feeds controlled by tabs at the top of the screen. The "For You" feed is the algorithm recommending high engagement posts to you. This is mostly accounts you follow but it's also highly interacted with posts. Love him or hate him, Elon's posts get massive engagement so naturally it gets recommended a lot.
Even if you have never personally engaged Elon's account, if the algorithm sees the people you follow have engaged with a post, it will be put into your "For You" feed. Same is true of posts from any user. This is not something specific to Elon.
The other feed, the "Following" tab contains content from only the people you follow. The "Following" feed is also chronological which is super nice and a rarity in today's algorithm driven social media world.
So if you're seeing random posts, chances are you're reading the algorithm feed, not your Following feed.
That's false, Elon Musk is a "topic of interest" on Twitter, and he is added by default to all Twitter accounts. To remove the tweets boosted by Elon Musk's algorithm, I had to click "Not interested" and then "Not interested in the topic Elon Musk," knowing that the other topics are all much more general (politics, technology, sports, news, entertainment...).
