If you take the art and just trace and polish it and nobody is any the wiser, in that situation yes. At least until that is found out, in which I will refer to it as derivative work over original content. It's why I am calling some of the digital art I am working on AI derivative rather than full-on original content.
If all you do is generate an image, do no edits whatsoever, and then act like you did it, then I couldn't in good faith considering "OC" since you did nothing but type a few words and maybe click a few buttons or moved a slider 3 pixels to the left.