the "driver" (the CEO, Elon Musk) is not "driving" (actively engaged in the running of) the "vehicle" (the business: TESLA). Instead it is "on autopilot" (employees are executing their duties without direction).
I didn't think this was a particularly hard riddle
@brianstorms @meganox @lifeinneon
I assumed that it's meant as a joke about Tesla's buggy driving capability + Tesla's stock price crashing + Tesla investors complaining that Elon Musk is ignoring Tesla while he's busy destroying Twitter.
I think Tesla's stock price is crashing because the cars are poor quality and the price was only high because of Elon Musk hype. Now that he's made it obvious that he's an idiot, the glamor is gone and the price is adjusting to an appropriate level.