I was told the same thing, to wipe it down, on my first humi by the very, very reputable manufacturer. This was and is a $500 100 count box. Everything turned out fine EXCEPT, it left a stain on the cedar. I have heard since that introducing that much moisture that fast can warp the wood, create gaps etc. Both the B&M's I use season the humi by lightly wiping them down.
"excerpted from editor and publisher Marvin R. Shanken's Shanken's Cigar Handbook
Take a new sponge -- make sure it is unscented and free of soap -- and wet it with a liberal dose of distilled water. Wipe down all the exposed wood, including any trays and dividers, and the interior lid. Avoid using a paper towel or a fraying cloth; these will literally leave a paper trail on the wood. After you've wiped down the wood, squirt the sponge with more distilled water, then place it inside the humidor on a plastic bag -- to avoid direct contact with the wood -- and close the lid".
I dont do this anymore.