From the article:

> In her suit, Viola acknowledged writing most of the posts. But she denied being behind the anti-Muslim screed. That was critical to Sorokin’s decision to allow the libel and defamation part of Viola’s suit to proceed. The former professor “has plausibly alleged that Benton may have been negligent in his failure to verify that she was the author,” the judge wrote.

If she can prove that it wasn't her/Benton can't prove that it was her (I'm not familiar with the legal system, so I don't know which it would be), then there would indeed be an untrue statement. As for damage; why does anyone dredge up another's darker side, if not to damage them in some way? I can't think of another motive for doing so.