It is riveted on, but I believe they're plastic. Easy enough to drill out. I tried to order mine without the holder, and the sales manager said he did. But it came with one. They said that for states that require a front plate, the factory overrides the delete code. Funny, because when I ordered it I was told that the holder was installed by the dealer. So, I'm not sure what to believe, but they may have just messed up when they ordered it.
I intend to remove mine. It just has 3 holes. The center hole is the highest and the only one to go through the silver trim piece. The other two are lower and go through the black trim so they wouldn't show much. The silver trim piece is about $130 with installation but is the cleanest way to get rid of the hole. If one could match the paint it seems a plastic hole plug would work okay.