Was the comment ever alive? If the commenter has had other accounts banned, HN sometimes has more thorough methods of banning a user (I suspect by IP, but I'm n

Was the comment ever alive? If the commenter has had other accounts banned, HN sometimes has more thorough methods of banning a user (I suspect by IP, but I'm not sure the details of the implementation). If you think the comment is worthwhile and have enough karma, you can vouch for it.