First, we're not DirecTV, this is a user to user technical forum and is not monitored by DirecTV.
I am not surprised you get contradictory and incomplete information. I can't find any info on this on the DirecTv web site, and I doubt any CSR has this information either. I seem to remember that DVS is delivered on a secondary language channel but I might be completely off base on this.
But I will try to find out for you.