The CEO is still responsible for their own employees, CEO hired them or directed them to be hired, the CEO (especially this CEO) runs the company.
Lying about features or the number of cars being produced etc. can't be limited to mere optimism because they mentioned specific numbers in a public way that were not true.
> fired for underperforming
The irony, since Musk destroys every brand and product he's ever touched. I've never seen a more polar opposite to the Midas effect at work. It has to be intentional.