Here's the relevant part from a different article:

Thaler, who listed himself as the owner of the copyright under the work-for-hire doctrine, sued in a lawsuit contesting the denial and the office’s human authorship requirement. He argued that AI should be acknowledged “as an author where it otherwise meets authorship criteria,” with any ownership vesting in the machine’s owner. His complaint argued that the office’s refusal was “arbitrary, capricious, an abuse of discretion and not in accordance with the law” in violation of the Administrative Procedure Act, which provides for judicial review of agency actions. The question presented in the suit was whether a work generated solely by a computer falls under the protection of copyright law.