I'll call BS on that
I would like to see your physics on that theory
Only difference is intake ducting gets cooler outside air in vs sucking in hot under hood air with a K&N style filter
Wanna see some physics in action?
Head to the airport...
air does not change velocity as it compresses and expands? The duct uses the very specific diameter MAF tube, then the expansion area into the TB where it accellerates.
Otherwise, why not make it all the same size up to the TB? The engineers wanted that little bump from compression/expansion/accelleration of the air. After all, the distance that a TPI air charge has to travel is a little extreme, the same reason why TPI is not a hi-rev design. It just cannot pull it that far, that fast...
In the case of semi-stock TPI motors, the CFM is low enough that a .09% increase ( guessing)in CFM from the ductwork is worth having.
Admittedly, the ductwork has obstructions (throttle plates, plenum ports, runners, intake valve guides) but the basic principle of natural aspiration works because of the "pulse" or wave effect of surging air flow.
Look at the grill in front of a radiator... is it cosmetic? or does it serve some purpose?
Its there because air accellerates and compresses as it detours around the fins or grill work. That in effect, means that more air hits the radiator.
Same principles apply to the ductwork. C-5s have a popular after-market duct portion called a "parbolic" something or another, where air collects in a bulb sort of thing before being shot into the TB...a c-hair faster than it would normally be.
Junk science? perhaps, but no more than the air-foil. That has proven positive effects even though most engines dont benefit enough to matter much, the effect is still there. Shaping and controlling the air flow...same principles.