Not trying to be a douche but this statement is incorrect. Starting at 2:04 in the linked video above he clearly says that the air comes in from the top of the SP3 "down through the center (of the fan) and out through the sides of the fan" into the case and out through the sides and bottom of the case.If air only enters through the black duct from the right side above the display port and not from the top edge at upper right it would seem there's no advantage to air directed at points on the side below the display port. From what I can see in the video this is the case.
Here is a discussion on a different forum that illustrates what is going on. Notice the IR camera picture validating this. I have taken IR camera pictures as well and can confirm the results:
I have tried forcing more air in at the top right as I said previously and it did not provide good results.If air also enters from the top edge on the right then there's more intake space to work with for greater air flow. I don't think air comes in from the top but I can't be absolutely sure.
It seems, GreyFox7 that you do not believe me or trust my results which I completely embrace as a fellow skeptic but I ask that you do some testing and analysis of your own and let us know what you get.