Chris -
A "pyramid of buy points" refers to his proprietary trading technique which is open to his subscribers (amongst whom I am to be profitably counted). Profitably for him and especially profitably for me.
In brief, the "pyramid" is a series of fixed price buy points, with a larger number of shares purchased as the price moves lower. i.e. - purchase 5 shares @ 28.05, 6 @ 27.55, 7 @27.05, 8 @ 26.55, and then invert the pyramid when you sell, so that the 8 shares are sold at the highest price., the 7 at the next lower sell price, etc.
Stewart's method and world view is best appreciated when you read him daily. I urge you to subscribe.
Jr.