Note that this is the dictionary definition of shadowbanning, which is the primary thing the free speech advocates on Twitter were hoping Elon would stop Twitter from doing.
I'm a Free Speech advocate. What I hoped Elon would do is stop the permanent banning of people from the platform and the removal of tweets. He appears to be at least somewhat delivering on that hope. Having a tweet 'deboosted' rather than completely removed and the tweeter also permanently removed is a substantial improvement.
Unless they're pretending to be him (or advertisers) for a joke on Twitter, in which case they seem to very quickly get banned.