According to the Paizo Community Use Policy:
You may use any of the text or artwork published in the Paizo Blog at paizo.com/paizo/blog, with the exception of excerpts of Planet Stories publications, Pathfinder Comics, and any logos and icons that aren't also in the Community Use Package. You may not use any photographs published in the blog (because those rights are usually not ours to offer). You may not use artwork, including maps, that have not been published in the blog, although you may create your own interpretations of material presented in our artwork and maps, provided that your interpretations don't look substantially similar to our materials.
So the distinction is that the actual card hasn't been used, just the artwork within the card? I'm not sure I recognize the difference, since it's effectively just a matter of cropping... but I'm not a lawyer. I'm highly interested in hearing the official response.