I genuinely don't understand the criticism. You don't find or enjoy working 70-90 hours healthy? That's your view and you likely shouldn't apply for this position.

Even assuming this is crazy, what's wrong with crazy people recruiting similarly minded crazy people? It's most obviously not a fit for anyone who wants to work 40 hours or wants to see their kids or whatever, but for those, there are plenty of other jobs. I just find it crazy that because of your personal views on work-life-balance, you expect Ng to have to change his desires for you. That seems wrong to me imho.