I've heard through various sources (that are more or less internet trolls)
So, you mean people like the ones that may be responding to your thread?
.22 cans are dry cans.
There is no reason you couldn't shoot it wet if you wanted. It might be even more ridiculously quiet.
My .22 Sig Mosquito/Spectre is as quiet to my ear as my buddy's AWC Amphibian. I would liken the two of them to a cap pistol.
Your mileage may vary and all that stuff.