I knew I will get this question. So, I immediately started searching for the post. It takes 50 Minutes to find this post. Here it is,
Based on their own experience, global moderators do not consider links to posts from Ninjastic.space, as well as Loyce.club, as evidence. Posts that are used as evidence of any violation of the rules by users should be on the forum on a mandatory basis.
So, Based on that. I assume Mr. Right will not get banned because he already deleted those posts before moderators saw the report. So instead of reporting them on the Report Plagiarism thread, You can report to Moderators silently describing the reason. Of course, if you badly want to get him banned. Or maybe you can ask him to add source and follow the rules.
Don't treat my comment as some sort of established rule on the forum. I merely wrote that I was based on my experience of submitting applications to global moderators. Such submissions have not been reviewed for rule violations. That's why I drew that conclusion. But that's not a statement, it's just my assumption. Only global moderators can give a definitive answer on this matter.