Shouldn't the RAT automatically deploy with a power loss? Can the APU be turned on if there's a total power loss?

I imagine with four minutes and already at task saturation they may have just forgotten to deploy the gear. I also wonder if they had a single engine when they decided to go around, and then lost power and decided to loop back to runway 19. I also wonder if they decided to keep the gear stowed until final to improve performance, then lost power and forgot to deploy the gear.

I guess some of these things we might never know, especially without the CVR