Everyone - or to be more precise, everyone moderating who actually cares for moderation and is not there just to feel the "ima powerful" adrenaline rush" would notice that the link is broken. On the new page there is nothing called "GroupBar" so the answer is already useless.
At that point a more constructive behavior would be to let the user know that they were better to use a different flag but still delete the rotten, useless answer. But that would take time, and if all you are doing as a content curator is felling good about your power, you won't have time to do much else than telling t…

You probably lack context. An user before pointed out they got a declined flag on an low quality link only answer that referenced a (now dead) third party component. They flagged the post as spam, the mod declined based on the tecnicism that you can't be sure that the user was affiliated to the product. Fine with me, but the mod also couldn't be bothered to delete the post either and basically took the spam excuse to "move next".
The post was blatantly bad and a correct option would have been telling the user to use a low quality or even better custom flag but still delete the post.