Maybe the flaw in this thinking is in the words "better job". That Musk bought twitter for all those billions with the intent to make it better. That he took on the duty and responsibility to bring "success". As a job. Work.
But maybe he just bought twitter as a plaything, a toy. Being rich enough to do so, and comparable to someone with modal income buying a high-powered jetski. A person a bit careless with money. And crashing the jetski, saying "Oh well.. I've had some great fun" :D