The jury https://www.worldphoto.org/2023-judges each member more than qualifies as a professional with a trained eye which means your assumption that it is obvious to a professional trained eye is provably false. I deal with AI generated images a lot and have seen a lot of these kinds of finger distortions in AI generated images as well, but with this creative category and the distorted william hope-esque style it's easy to attribute the distortions to other effects if you don't already know or assume it's AI generated.