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Pure snake oil. Most modern ECU's are not that much affected by IAT temps. In fact, you will find that they will still operate in closed loop. Biggest thing they affect are total timing, as timing modifiers will add or take out a degree or two of advance according to temps.
The ECU pays the most attention to the O2's. And if the ECU richens the a/f slightly when it sees a cold IAT (or leans a/f slightly when it sees hot IAT) it will quickly figure out that something isn't kosher and KAMRF will correct those short term fuel trims, and eventually make them long term fuel trims.
And if it ignores it enough, it might even through a CEL telling you the IAT sensor is suspect.
Snake oil for power gains, and snake oil for fuel economy gains.
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