Which parts are unnecessary and which people should be fired, is not one of the basic questions for which you're going to get a good answer in a short timeframe. Now it's clear that there's a lot of animosity for Twitter in this thread - maybe people don't particularly care of the decisions made in this process are correct or just because they all had it coming anyway - but imagine someone doing this to your shop. Come on. It's ridiculous. You'd be pissed.
Your scope of investigation is much larger than the one I stated. One thing neither you or I know at this point, was it a 2 hour visit or is it one of Musk’s marathon “pull up the couches cuz we ain’t going home till we figure this out” sessions.