I don't know the answer to the questions you asked, but it's worth pointing out that "overpaid" can just as likely mean "I could have gotten it for cheaper" as it could "I paid more than it is worth."
The point is that Musk didn't acquire Twitter for business reasons. Nobody thought Twitter was a great financial opportunity. He acquired Twitter in order to change Twitter, for whatever his actual goals may be: "save humanity", "free speech", shits and giggles, etc.
