No, if Mapes or any of the usual leftist suspects were involved in this forgery attempt, it would have been a smear to try and portray Reagan as a pedophile, or homosexual, or some other garbage because the one thing the left loves to do more than even breathe oxygen, is to try and trash the good name and memory of the 40th and Greatest President of these United States.
True, it is rather innocuous. If Mapes had done it it probably would have been written in a child-like scrawl saying "Gorby is good. I like him. He let me win the Cold War. I shouldn't have left the Democratic Party. CBS is my favorite network. The governor of Texas is a bad man."