Here is the issue with your logic dtc100. These fans DONT actually add air, they add restriction, they are incapable with moving enough air to keep up with the demands of the engine. (plain and simple and engine is an AIR PUMP) The more air it moves the BETTER it preforms. That being said, to make it better the fan has to move MORE air than the engine can on its own. On top of that the fans are incapable of producing POSITIVE air pressure (what is known as boosting). Therefore, these do not do squat.
If you watched the video you would see the boost gauge the guy ran show NO PSI in the intake. Meaning that the fan is moving less than or equal to the amount of air the engine is able to pull on its own. Oh btw at idle if it can't keep up at WOT, it will fall behind. Because the amount of air pumped increases with the increase of throttle.
Also do you understand how a turbo actually works?
Exauhst gasses spin the turbine which is directly connected to another turbine that inducts air. That air induction is GREATER than the amount of air being drawn in by the engine. That is possible because the exauhst gasses (the gas being expelled by the engine) is propelling the turbine. Which means the more air being taken in means the more air being expelled. The greatest factor of all of this is because it brings in more than the engine needs, it creates PRESSURE. Pressure at the valves means the engines stroke does not determine how much air is inducted it flows into the void freely because inside the piston there is less pressure than outside. The only time the pistons do the major work of taking in air is when the car is started after that the natural cycle of the motor takes over.
Also maybe you should read this.....
http://www.pistonheads.com/gassing/topic.asp?t=919935
Maybe you should also read up on air density.... (which ironically is what a MAF measures....)