If you wish to repost an item that is in the dead post category, feel free. Especially if it has been dead for a while. If that is, in fact, what you were asking. Posting items(or re-posting) is the best way to get points.
The post queue is flushed a few times a day, so depending on exactly when you posted, it could be very soon, to a few hours before your post goes live.
(Repost) doesn't mean that the product needs to be reposted, only that it has been reposted. Dead Posts that have been reupped include (Repost) to let people know that it has at one point in time already been posted to the board. When you have thousands of assets, it's nice to know if something is new, or if something is a repost.