They have already addressed that Mouse and Keyboard usage is not cheating and should not be reported:
However, we have put serious research and development against this problem and we’re hoping to have a solution to what we consider to be unfair circumstances. This is a priority for us and we’re trying to combat this through technology and policy.
The report notification is a response that one of your reports (whether it be for cheating, spa, abusive chat, inactivity, or gameplay sabotage) has had immediate action on a real player. That is not automated in any way. If you are getting them it means your reports are making a positive impact in our community!