Yes. He was ousted as the presidential candidate. His replacement has now been officially selected as the new candidate.I love reading and learning about major (previous) conspiracy theories that turned out to be true.
Watergate, MKUltra, COINTELPRO, Iran-Contra affair, Tuskegee Syphilis Study, Op Chaos, The Gulf of Tonkin Incident, Op Northwoods, The Doolittle Raid Deception and Op Paperclip. That's 10 examples of major conspiracy theories that were later discovered to be factually true.
I'm currently reading 'CHAOS: Charles Manson, the CIA, and the Secret History of the Sixties'.
A mental book, that touches on a couple of my above examples.
---
In terms of a current coup with the Democratic Party, the DNC and Biden... Coup is not the right word, imo. However, he was quite clearly ousted by 'higher-ups' once it was quickly determined that he (they) had slim chance of beating Trump in the next election. No matter what side we prefer or lean towards, there should be no wilful denial of that.
But calling it a coup is willfully misrepresenting it and typical Trump (and his followers) rhetoric