The article is about retiring at 30 as a millionaire, and yes that requires living a frugal lifestyle. But if you're willing to work longer, far less frugality

The article is about retiring at 30 as a millionaire, and yes that requires living a frugal lifestyle. But if you're willing to work longer, far less frugality is needed. The book is pretty cheap (!) and well worth a read if you're interested it becoming financially independent. There are lots of financial advice books, this is one of the better ones, and the advice is straightforward. It doesn't involve learning option trading or real estate hacks.