Not sure how this differs from Apollo.
I mean, I'm half joking, I believe that it is a possible objective, as much as it is possible to manufacture 500k Model 3s a year.. next year. Possible, but a monumental effort and something on which Musk strongly disagrees even with the top managers in his own companies.
This does not seem so impossible. A couple of delays will happen, but all in all, there is no fundamental problem.
Plus the actual evidence for Elons companies being far worse then anybody else is not really there.
Plus, its not like all those educated people that work at SpaceX would live in the gutter if they can't do the job.
You know (if you're a developer) when you're working on a very exciting piece of code that will do wonderful stuff, and you have clear in your head what you're doing and how to do it, and think "it'll take me an hour, can't wait to see it working" and then at 4 AM you're still there, always in the same state of mind, with half of your brain asleep and the other half still perfectly focused on the result? Yep, I think that's Elon Musk. Still in the splendour of his early twenties :)