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.
Why do you assume that the user deleted his posts himself and not the moderators? Those reports are months old, so there was plenty of time for the moderators to react, which they probably did. Mr.right85's
profile on bpip.org shows that 7 of his pots have been deleted by moderators. Second, if you read the OP's post more closely, you'll notice that he quoted reports from the Report plagiarism thread.