Trump has lots of enemies sueing him of all kind of things which he been cleared to some of it. He has created powerful enemies on top. Because Musk is Trumps partner in many ways, it's not surprising that Musk will also be facing these problems in his business.
Yes it's a sham because everyone knew Musk owns twitter, it do sn't even need reporting anymore. But I guess they can do it after all if Musk didn't report it on papers, the SEC can get money out of it.