Actually he is right. You could use a bow and arrow underwater but it is far less effective. Way too much drag, and the arrow basically drop off after 10 to 20 feet. I'd have to agree that many on here either don't swim or at least didn't spend much time in the water. I've been kicked underwater, although by accident, and it hurt. Left a good bruise. I've also used a spear underwater (snorkeling). Swings don't work so well due to the increased drag but thrusts work just fine.
Mind you, who would be able to swim across a lake in a full set of steel plate armor?
This is semantics. You could (if you were stupid)
try and use a bow and arrow underwater but it`s so useless it would be pointless, so it is as good as NOT using a bow and arrow underwater.
And I did not say you couldn`t use melee weapons underwater, just that in a fight against an underwater creature like a shark they would be next to useless and at least 60% worse than in the open air.
I just love the way you listen to the bits you want to but ignore the bits you don`t want to have to accept.