Why wouldn't it know the direction of motion for the swipes and the orientation of the finger? Any mobile app has access to the touchscreen input which provides exactly that information.
Then there's the fact that there are more than 20 minutia per finger so when referring to orientation, this means the angles and what portion of the finger is in contact with the touch surface... and thus which of those minutia (swirl, end, fork, etc) are in generating any sound.
Most people use their forefinger or a thumb to swipe, and their thumbs to match/type, and multiple fingers or both thumbs to scroll/zoom.
More interesting is that if one had full knowledge of a persons prints then perhaps with microphone, touch tracing, and wide angle video, one could compare expected vs measured sounds. This is a one-one confirmation rather than one-many match. Perhaps it could prevent long term usage after a person had unlocked their device and another was using it.