I read the book. Basically, whenever you need a loan, borrow it from yourself and pay yourself interest. Cash out your tax deferred investments, pay the tax, and buy whole(universal) life insurance, which you invest in stocks or whatever. Anytime you need a car loan, etc, borrow from the policy.
In retirement, draw down your cash value.
Mostly just a new sales pitch for life insurance. Not a bad plan if you have (a) met your goals already, (b) have surplus cash and are worried about future tax rates, and/or (c) have already maxed out other vehicles.
Personally, it doesn't make sense for me because (a) I would never need to borrow money. If I don't have the cash, I can't afford it, and (b) I would rather do a ROTH conversion to protect against future tax rates.
That being said, if I suddenly came into significant after tax dollars, I would consider it as another leg in a four legged stool. Or something like that.