No. Copyright is copyright with an owner while CC0 is just a public domain "without" owner... It is a terrible world of IP (Intellectual Property)
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I've just asked MedicineStorm (OGA admin) about it:
https://opengameart.org/content/uno#comment-107016
https://opengameart.org/content/uno-playing-cards-2d#comment-107017
AFAIK itch allows to place here "fun art" and similar...
What would I do is to leave it here, delete license metadata and place warning/disclaimer in the description. Something like: "UNO design belongs to UNO creators so it is a fun art recreated in pixel art. Using UNO design without their permission is (can be) illegal so be aware and etc" ¯\_(ツ)_/¯
