This poor guy almost lost his life and by what I've read won't be carving soon if ever again. Yet APD feels the injuries were from a moose or bear rather than a man ?
APD- Brown Bears attack and retreat. 
Black bears attack and consume. 
If a Moose is using its feet to attack it's usually the front. A young moose would run. A Cow would fight but doing so would tear up the ground making it obvious. When they are being aggressive they stand on their rear legs using the front legs as the weapon. Again the ground would show hoof marks from a 1,000 pound aggressive moose.
Sounds to me like your victim was assaulted by Alaska's most dangerous animal for sure. The two legged kind.