No, while the argument commenced in the report section between them both+staff, R2 brought up the fact that he knew he had black hat activities;
http://www.sythe.org/report-scammer-archive/1634712-r2pleasent.html post #15
He didn't stated what they where tho, but if he found out which hackforums account he had, he obviously saw his posts. This was when lazy reported him ;
http://www.sythe.org/report-scammer-archive/1634940-traxar-scammer.html
He
knew that traxar had blackhat activities
before they agreed to tradr the gp (aftersomehow getting the account banned with the gp in it) and you can clearly see
after his 15th post (after he states he knows traxar's a hacker) he agrees to buy the gp.
edit; in short, r2 knew he was a hacker with blackhat activities, he just didn't report him. the trade commenced after r2 tried to blackmail him via stating the above quote.