From my experience, the deep 'roar' grunt I heard was none of those vocalizations. The closest one would be to take the last grunt from the breeding bellows clip, make it deeper and intensify it 100X and you get about what I heard. Picture a deer so agitated he's trying to kill the other deer, and turn that into a deep,loud, intense grunt.
While I too have heard the groans a spined deer can make, and they are gutteral, to me they are different than the buck 'roar' noise.

Anyone here hunted elk? you take a run of the mill bugle and note how it sounds. Then you take a really ticked off herd bull bugling to (what he thinks) is his cows and note the emotion and deep gutteral sounds that begin that bugle. Worlds apart.

I believe the 'roar' grunt is a very seldom heard noise. I think you need the right mix of an aggressive buck being pushed to his limits.

I also think that capitalizing on the 'roar/growl' is beatiful marketing. I heard the thing and really doubt I'd buy the call. It's just not common enough for me.