The title of this article is a lie. The case it talks about is only judging the case where someone used an AI they created to generate an image, without human input then tried to claim the AI as the author and himself as the copyright holder on the work for hire clause/being the owner of the AI.
The conclusion was basically that a work need some human creative input to be able to copyrightable. It does not answer the question of how much work is required when AI is involved (and explicitly calls this out).
So using AI as part of creating a work does not mean it is uncopyrightable. Only the case where you have put in no input into that work.