I wouldn't do that. Break-in has to heat the parts up to operating tolerances to work properly, which the LHS guy's technique just can't do. All you'll do using his technique is ruin your piston. These engines use a tapered sleeve which will literally squish the piston if they aren't warmed up enough. If they don't do that, they will instead just grind away at the piston, and themselves a little, until you have no compression left.

You can loosen the glow plug a quarter turn while starting it to ease the load on the starter, though. Once it's running, tighten the plug back down, then drive it around a bit and ensure the temps get to 200F. Don't jam the throttle open suddenly or anything, but do ensure it warms up enough. When you shut down, put the piston at BDC while it cools.