Based on the response to Migrating a question deleted a comment, comments regarding migration should be removed after migrating.

The following post contains a situation where the comment was not removed, thus required a flag as "no longer needed".

As of the time of this post, the example can be found here: Is it a good practice to add code on an existing class with thousands of lines when adding a new feature in a legacy Java project?

I tagged bug due to the intended behavior mentioned in the first linked post.