It was originally both located (what we might call an "institutional home") and indeed published at Harvard University (or at least in Cambridge). "Home" and publishing location are not always the same.  For example, Mind's home is the University of York, but it's published at Oxford.  I do not believe the editor has to be located at the home, especially not anymore with email and cloud storage and all that fancy stuff.  I think the reason it helps to mention that it was originally at Harvard is because both the old issues list the location as Harvard and citations may list Harvard, so keeping a record of that here helps anyone trying to understand that the old issues are indeed part of this journal. Also, it could be recorded just for the record—it is part of the history of the journal after all. (Discussion, Contributions)