There's some good tips in there as well as some bad ones, but none of that is the point. The point is simple: spend money on things you care about; spend nothing on things you don't care about. The author doesn't care about eating out, but that doesn't mean no one else should. People are different. Any financial advice that doesn't take that into account is missing the point.
There's also the interesting idea of "don't disturb your contentment," to paraphrase. Drive a modest car and be happy; don't rent a fancy one or you'll start wanting it.
Each person has to decide which things are worth splurging on. But the answer can't be "everything." Keeping your expectations low in some areas is a good idea - and if those areas are expensive ones, like car and house, all the better.
