Perhaps the Schering edition is considered to be an "arrangement" because the original wouldn't have had crescendi/decrescendi, however implicit these may seem in the music. Also, without the original manuscripts for comparison, the various dynamics as printed are unconfirmed. There are also no figured bass indications in the Schering edition. Do these "additions" or "oversights" (depending on one's point of view) really make the Schering edition an "arrangement"? What do others think?