I noticed that my comment to this answer has disappeared. Why did it happen? If the comment was flagged as outdated and then removed, I believe this is wrong. The first part of the comment was about the confusion with integration limits, that has been corrected in the answer. The second part was about a substitution which is not justified and would give a wrong result for certain input values. That part is still very much relevant.
It was indeed flagged as no longer needed. Given that comment, edit, and reply to the comment were a week old, I validated the flag and deleted the comments. I did not check whether the complete comment was made obsolete by the edit, knowing one who flagged as generally reliable.
In principle, I'd support hardmath's suggestion:
If the second part of your Comment is still germane, you can repost it on that Answer.
In this specific case, your comment has already been undeleted and the obsolete part removed by a colleague.