The idea is to get the high metal cam lube on the faces of those lifters and lobes to start spinning the lifters. When you decelerate for longer duration, like going from 4500 down to 2000 it unloads the engine and allows the cylinder tension to drop from being under load, back down to just spring and cyl. pressure. This allows the lifters to unload and allows them to spin.
All you are accomplishing is pattern and Rob's suggestion there is what makes this happen.
