I don’t think this is true. I had an Aviator refinished by CRK, they told me when I took it in that the new finish is a little different, that was fine with me. Below I attached two pictures, in the first one, there is two original finish Aviators and the bottom knife is the one I had refinished. It’s a little hard to see, but the two original ones have a little darker and a shinier finish. The new finish is more matte and a grey hint to it. In the bottom picture, I switched the end caps on the two bottom knives and you can see the difference a little better.
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As far as the original posters question, like anything, it is only original once, but his knife currently isn’t original, the original finish has been altered, so I’m not sure it is more valuable at present or if it was refinished. For me, I would rather have it refinished as I’m not a fan of the current camo finish. Keep in mind that it can take a couple months to get refinished.
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