The linked PDF source does not back up the article or title. Page 19-20, Who deleted the comment – Deletion or Moderation?: > It is essential to emphasize that

The linked PDF source does not back up the article or title. Page 19-20, Who deleted the comment – Deletion or Moderation?: > It is essential to emphasize that identifying the actor responsible for deleting a comment is not feasible. [...] Therefore, this report treats the three reasons for comment disappearance as a single phenomenon. Or in other words, it counts all removals, and we know that moderation always removes based on more criteria than just legality, regardless of what those laws are.