Black Speech is not Orcish (although the orcs do use a few corrupted words), 'Orc' doesn't come from 'tark' (it comes from the elvish urqu, while tark is an Orcish corruption of 'tarkil', meaning 'man of the West, Numenorean'), and all in all, there were enough silly mistakes in there that I'm sure it's not real. But, as you say, that's completely beside the point.