Jack Daniels (the company) confirmed that this is more than likely. Unfortunately, there is little to no documentation on the major impact slaves had on the American whiskey/ distillation industry. See an article about this in the New York Times.
Very Rare image of Henry II King of Italy and Germany also Holy Roman Emperor during the time of the Ottonian Dynasty. From the Sacramentary of Henry II Undeniable proof black presence throughout Europe.