It's all right there in his book, but like anything that inspires people, most people read what they want to read and not the actual words on the page.
The secret to this is that this doesn't require capital at all. You don't need anything to learn how to arbitrage, money, goods, or time.
People do this all the time with 14 day invoices etc. You have to be a little creative and very skilled but it's possible to make something out of nothing because you're providing value- especially when you get paid up front with a deposit.
It's still about being super efficient though (4 super efficient hours a week. Let's be honest anybody who could do that would do it more than once a week).
Steve Pavlina is one of the first superstar of the online self-help world (dating back to 2004 or 2006). It started with an article on a famous website for programmers (can't remember the name atm) about how he dig really deep with his first game and so others were playing catching up but he was raking in a steady monthly income (see where we are going and who would be interested ?).
Then he started his personnal weblog (yeah, we used to call'em weblog in my days) about self help and how he experimented with polyphasic sleep (sleeping 3 or 4 hours a days in twenty minutes increment, see the kind of folks that would bite that bait ?). So far, so good.
Then he went full crazy with psychic powers like talking to bird, being a telepath, reality shaping (aka the secret), etc.
His article were 10 or 12 A4 pages long (wonder how that goes nowadays) and it was kind of mesmerizing to see all that happening in real time (I admit I got first intrigued with his time management article and I kept reading for the crazy).
There was a funny experiment with polyamory and it ended with a divorce.
See http://edificial.blogspot.com/2006/08/church-of-steve-pavlin... for the church of pavlina and https://rationalwiki.org/wiki/Steve_Pavlina for links and stuff.
Of course they guy was kinda successful (financially).
I believe it all started when the Church of Pavlina opened and easy access to personal development blog fueled by Ferris and others. The ubermensch was promoted. At the same time Amazon and Facebook showed that you could make it big or be a slave so.. fear of doom and american success stories à la "you too can do it if you want" ?