That is why Reddit got rid of the "sort by vote low to high", because it would bring to the top all the stuff they were trying to bury. People learned how to find out that they were shadow banned and make posts about it, exposing Reddits propaganda. By using manipulation of vote counts they could burry the comment to where no one would ever see it. There is no way to prove that the vote counts were manipulated. The problem then became that those comments were all still easily accessible with this tool. So they got rid of it.

You can still pull up "controversial comments" but those are not the ones they are afraid of. It's the ones they burry with nothing but downvotes.