And if an AI generated those wights, they are not copyrightable
Ultimately it all hinges on the specifics of the training and how much human involvement was involved throughout the creation process. I suspect arguing this successfully in favor of upholding a copyright would be an uphill battle for many situations, but ultimately we'll need more court cases to know for sure.
The copyright office's recent statement on this matter were sensationalized when they really said nothing groundbreaking at all -- this was always the standard applied when any tools are used in creating a work.