If somebody else besides A. Sherrod Blakely (who is almost always wrong about everything) reports that Boston is the number 1 landing spot for Horford, I will walk back from my "this tweet has nothing to do with basketball" stance.
Maybe Horford told IT that he's willing to re-sign with Boston if he is traded there, and IT shared the news with his teammates. Thus, the Major Key alert. It's still a long shot, but my imagination is now running wild.