Imagine that a supposedly academic journal intentionally publishes an AI-generated article which is full of claims which are easily verifiable nonsense to any expert in the field. The article is published under the name of a real academic who works in the field, and that academic had no involvement in creating the nonsense article, and would definitely not have agreed to publish it under her own name.
If a member of the academic community in the same field were to read the article and believe that the author attribution were correct, then they would most likely form a low opinion of the supposed author's competence in that field. However, an ordinary member of the public would not have the expertise to judge that the article is nonsense, and might think that having published an article in the field is a positive indication of her expertise. The article itself doesn't contain any statements about the claimed author's expertise, the article's only claim related to her is that she is the author.
Is the journal's false attribution defamatory?
This is a hypothetical question not restricted to a particular jurisdiction, so answers about any jurisdiction are welcome. The question is inspired by a real situation posted on Academia SE, but the question should be answered based on the hypothetical facts stated here, not in that post.