In the referenced paper the trigger for the filter is lack of novelty, not any specific content. In neither of the cases you present would you be able to demon

In the referenced paper the trigger for the filter is lack of novelty, not any specific content. In neither of the cases you present would you be able to demonstrate that a filter like this could be operated in way to discriminate on content rather than on novelty other than by shifting the corpus in a manner that would be obvious to everyone.