Ah yes, the old "this has be discussed before" statement that assumes that everyone has already read everything and that new people to the group should always search through old posts about subjects they may not even know exist. Because nothing must ever be discussed more than once.

Usually stated by people who feel the need to comment in the thread about an article covering a subject they've already read about; just to point out they don't want to read about the subject again. It's like a driving need to spread their negativity towards discussing anything more than once.