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
https://loyce.club/archive/posts/I'd imagine the post would include and could be reported for plagiarism (especially if it's done near the start of the thread).
Mods are normally fairly happy to remove posts that don't add value to a topic or mention something new/different (that could count as plagiarism).