Besides the horrifying parts (fascist conservative dictatorship, proscriptions, mass murder), it's hilarious to me because what Sulla did didn't even work; the post-Sulla settlement dissolved when Caesar crossed the Rubicon 30 years later.
In effect Musk is saying "we need to do mass murder to stem the liberal tide, but then get washed away by that very same tide within a generation," anyone with actual historical knowledge of this period would say this makes zero sense.
Since americans are utter asshole dipshits who don't know what fascists are, which Musk is one, barring that, imagine seeing the way he runs twitter laid bare for all to see and still wanting him to be your emperor on Mars.