To be fair, with the FT02's positive air pressure, there is just as much air moving through that grille as when the outtake fan was installed. But yeah, that article doesn't seem particularly relevant.
I have a FT03 which is very similar in airflow to his FT02 except i don't have the intake bellow (the fan didn't fit in there with the Mega Shadow). As stated before, very much depends on the fan speed, and when he uses ULNA he has only 1000RPM 9cm fan blowing through his heatsink, which means not lower performance.
Then we have the difference between what frostytech measures and what can you measure. Frostytech measures surface temperature, but the applications on your PC report Core temperatures. There can be huge difference between these two values, and the only way to measure the same value is to drill a hole for a temperature sensor in CPU IHS, which none of us will do
And then there can be a huge difference between each piece of CPU - one CPU can overclock to 5GHz, another has problems with 4.4GHz. One can have higher temperatures than others, easily even by 4-5C.
In the end you have so much variables that you just can't say "there is something wrong with that temperature" unless you have exactly the same setup and have more than 10C temperature difference, or unless he has 75C+ core temperatures.