I dont know where they got reanimated from. In the trivia he got his soul back which should classify him as revived meaning back to life. Reanimated means the body isn't living. Just mimicking life.
If you play it again. He is eating meat when atreus say hey brok. He said he was on his break. You can see he's cooking his food.
However the Lost Page of Norse Myth episode, The Forging of Leviathan, contradicts this, as it states that while Brok and Sindri were creating the axe, a spider bit him which poisoned Brok and killed him on the spot. Sindri had to go to Alfheim and dove into the Lake of Souls to claim Brok's spirit before it would be lost forever. When Brok came back to life his skin remained blue and Sindri became twitchy, this is from the trivia.
No, he dies at the hands of thor.
No, it's brok. He's classified as reanimated. Reanimated don't eat food. Only a living being does eat