"Is this based on personal experience, "

It is based on the fact that be publicly fired very competent people on Twitter for contradicting or criticizing him.

https://timesofindia.indiatimes.com/gadgets-news/this-is-wha...

https://www.businessinsider.com/tesla-elon-musk-ruthlessly-f...

He also publicly mocked all the people he fired

https://www.ndtv.com/world-news/elon-musks-dig-at-sacked-emp...