The author is an imbecile. This is not a coup. A coup is when you evict someone by force or the threat of force. This is basically an ouster via majority vote, i.e. democracy in action.
That’s one definition, here’s another:
2: a brilliant, sudden, and usually highly successful stroke or act
She pulled off quite a coup when she snagged the usually reclusive author for an interview.
We know, it's the message that counts. Glad we have an English major on site to correct the writer......Sheesh!