If a user corrects his own post, he doesn't get banned.
Do you know that for sure?
I can't be absolutely sure, but it wouldn't make sense otherwise: why would someone get banned for a mistake he corrected on his own? If the reporter doesn't want to give that chance, he shouldn't post publicly about the plagiarism.
I've mentioned it before: dumping a list of references shouldn't be allowed by the forum: posts should specifically highlight (ideally by quoting) which part comes from which source
I was of the opinion that anything copied from internet should be attached to a post as source/reference. That is what I did.
Showing a link is enough to prevent a plagiarism ban indeed, but dumping 10 links doesn't help someone who wants to verify what you copied from the original source.
If you use quote/author-tags for anything you quote, or just add it as a description to a hyperlink, you give credits in a much better way.