Who Owns Pseudo-Beethoven?

I am wondering if standard copyright applies to the score of the AI-generated orchestral work constructed after the drafts of Beethoven’s 10th Symphony, which was performed recently by Beethoven Orchester Bonn and Dirk Kaftan for the Beethoven 2020 anniversary. Given that it isn’t actually a human work, and that it is uncertain how significantly Walter Werzowa contributed to it, shouldn’t it be in the public domain? Maybe the Beethoven-Haus Bonn can clarify.