If you really care you can test it by playing one match with a hunter getting a melee and throwing knife kill and see the change in your totals Throwing knives dont help melee bounties in crucible. https://www.youtube.com/watch?v=Denarux7SOA 28 seconds in it shows shoulder charge showing the same icon as a melee "After sprinting for a short time, press (R1) to unleash a devastating melee attack." The game calls it a melee