Maybe I'm wrong then but it just seems illogical to me that the gasket can cause the noise at all because if the gasket was leaking that bad the air would be being sucked in through it and you'd probably hear a noise but it would surly be more like a vacuum leak as I said before, because the air entering the engine isn't passing through the actual valve and it's already established that the valve malfunctioning is what causes the noise.
I think a more likely explanation is whoever claimed the new gasket cured their moosing problem has cleaned their IACV once which didn't cure the problem, put it back on with the old gasket and found it still moosed, so took it off again, cleaned it a second time which did cure the problem but also replaced the gasket with a new one and when they found the moosing was gone, they assumed it was because of the new gasket and not because a second clean actually did the trick.