While it sounds possible, in the realm of possibilities, that the coating might hide the material underneath it -- the handles -- it does not seem remotely possible that it could hide the blade which is not coated.
Just a few days ago, there was a thread about a G-10 knife and concealex/Kydex sheath, and how to get away from just one or two brass grommets or whatever, because they would trip a sensitive detector. I'd have to have it proven to me that an uncovered steel blade could go thru undetected.
However, I will say that I once went thru a metal detector with my CRKT Kiss used as a money clip, and had several bills not in the clip that were apparently against both sides of the knife. Had forgotten about it. Really surprised me.