> No, this is already established in the US.
The case you're likely thinking of [1] is not at all this case. Thaler tried to have the AI assigned the copyright, then transfer it to himself. USPTO denied that the AI could have the copyright, so it could not be transferred.
This is completely the opposite of what this case is. He wanted AI to be the sole copyright holder, which the court ruled cannot be. Any creative human input to make the AI create the image (text prompts, post selection from among any images to find one that is good) is fully copyrightable by the person.
The text that an artist uses and then selects final images from are both considered creative enough to make the final copyrightable, just as if they entered numbers into Photoshop tools to make an image the way they wanted it. Plenty of these are creative enough and take significant tweaking by the authors via the text they fiddle with to be copyrightable, the same as the text they created to generate the work.
[1] https://www.copyright.gov/rulings-filings/review-board/docs/...