You can't plagiarise yourself. Copying the same post into another or multiple threads would at worst get you a temp ban if it was deemed spam. The post that was reported was this:
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User/I made a mistake post one years ago. If this is the only mistake he/she obviously got familiar with rules and changed the behavior. Why ban if user is no longer making a mistakes or act against the rules in period like 1 year or longer. In this case delete the post and send user a warning: you made mistake 1 year ago we are glad you changed the behavior.