As I have not seen the "snap" technique, is it in any way similar to the abinico (fan) technique used in Mordern Arnis?
No--that is a swing that hits with the flat of the stick (vs. what would be the edge if it were a sword), and that is a different type of wrist motion--around the axis of the forearm, whereas the KMA version is in line with it (more like a cracking-the-whip motion).