The manager of the campaign most probably would not care about such edited posts
Manager (and forum users) can only see edited if they visit a specific topic to see that post. If the manager only count posts in post history of a participant, it is impossible to know that post was edited or not.
I have a question about reporting such posts, If the user edits the post before a moderator can check out the report, what would be an appropriate response to it? Especially if the new post is not worth deleting.
First, such reserved post is non-sense and should be trashed.
Second, moderators can check content history of a post.
Third, they can use unofficial resource to check, like from Loyceclub.