A good number of "world changers" prioritize their work over everything else in their lives, including themselves and the people around them. They expect their team to do nothing less, so if he did say that, I'm not exactly surprised.
This wouldn't work for me, and I'd imagine it wouldn't work for a lot of people who prioritize their families over whatever project they may be working on. I still like Musk and the things he does, but I have no desire to work for him if that means working 24/7 like he does.
You're saying it as if Elon was Genghis Khan. He's not conquering anything, he's just trying to solve two of the big problems of humanity, and he invites volunteers to help him. You don't believe in his mission? Don't join, and don't take places because you want to "build a resume" (it seems to be a recent trend now). It's not like he doesn't keep saying that Tesla and SpaceX are not ordinary jobs.
How is that a mistake? His companies both had periods where they barely survived, and now they are driving forces in solar power, electric cars, and private space operations. Had the people there not been as dedicated as they were, some or all of them might not still be here.
This wouldn't work for me, and I'd imagine it wouldn't work for a lot of people who prioritize their families over whatever project they may be working on. I still like Musk and the things he does, but I have no desire to work for him if that means working 24/7 like he does.