Someone within reddit clearly doesn't know what harassment is or what can constitute as harassment. The warning they gave out was "a direct message on x day" instead of what was within that message that could be considered harassment. This does not help them and definitely does not help the potential offender. This is done because they clearly know that there was no rule infraction and to make others think that this gives them creditability. This does not.
What could potentially be a learning aid is nothing but a hindrance done to give a false protection. They know what they are doing and that is why they are doing it this way. Reddit clearly isn't the site it used to be. They protect toxic users and subreddits. They clearly have an agenda which makes the site completely unhealthy.