I agree with the sentiment, but Meditations was always written to be published though. It was less a private journal and more a write-as-you-go self help book. Marcus (Marky to his friends) hoped his writings would be read widely as it would spread his thoughts on stoicism etc.
I assume this is a joke or satire, given the 'Marky' bit? Meditations was absolutely not written to be published. Not only does he say (and imply through omission and other statements) some pretty damaging things about powerful people whose continued support he needed to rule effectively, much of it has very specific personal context that nobody but himself has ever been able to understand or interpret. A lot of it is referencing past events from his life that he doesn't explain, so is meaningless to anyone but himself. He talks a lot about admiring people whose names and specifics he never mentions, and then massively insults people like Herodes Atticus through omission (and negative anecdotes that imply him), someone who was a famous and powerful intellectual at the time, and a tutor that was a big part of his life- he had a lot to say about what he admired about his other tutors.