The reason I disagree with this method is that until the rings seat, you don't want to boost the engine. The ideal way to break in a gte would be to remove the turbo and rail the piss out of it as soon as it's warm. After a few heat cycles, 100 miles or so, put a turbo on it and have fun.
I drive my turbo cars 500 miles late at night just stop and go with as much throttle as I can give it whilest maintaining vaccum. One time I just turned at every stop sign in a residential neighborhood. The miles pile on quick when you're litterally going in circles.