Yeah, but that's only 3 months, he needs to figure out ways of getting more passive income and the rent and food costs is likely to be ridiculous if he's going to live in a major city, your maths is way too optimistic
I would honestly suck it up and save up until you can really afford to move out, that's what I'm doing now, it can get really unbearable and claustrophobic at times so I know what it's like but it's better than being like everyone else and ending up with their parents a few months later because they can't pay the bills because that's seriously what is happening to everybody, don't move out until you have a good income you know you can keep going, you need to think in terms of 5 years or more not just a couple of months.
p.s. learn to cook no matter what, it will save you a lot of money