I flagged a post by a non-newbie as "not an answer". In such cases I usually go look at the other answers by the same user and here they are clearly everything but great. This answer strikes me as particularly useless: he actually dug up a question that is 9 months old only to repeat what the previous three answers (including the accepted one) already said. With the main difference being that the other answers provided additional information while he didn't.
Should such answers be flagged? If yes - what should be the flag reason? Technically speaking, it is an answer. Also, I noticed that moderators tend to disagree about "very low quality" in such cases because it does answer the question and probably would be acceptable if it were the first answer for the question.
Edit: Just realized that this answer by this user follows the same pattern - it has been added almost a year later and is repeating the existing answers while being less helpful.