I believe that is only the tip of the iceberg, given anti-vax narrative and transphobia is endlessly repeated by those on the far/alt-right. I see the "Prosecute/Fauci" tweet as a signal towards his intended audience for what kind of place he wants Twitter to be.
I have believed from the start that Musk's main motivation for buying Twitter was giving a boon to the Republicans to buy favorable treatment for his companies, because he isn't getting that from the Democrats.