What I was able to skim is a bit more complex like that. Page 42 of Part 2 says using it "as a tool" produces copyrightable works:

> As described above, in many circumstances these outputs will be copyrightable in whole or in part—where AI is used as a tool, and where a human has been able to determine the expressive elements they contain. Prompts alone, however, at this stage are unlikely to satisfy those requirements.

Then, since this stuff is changing a lot, they hedge with:

> The Office continues to monitor technological and legal developments to evaluate any need for a different approach.