I think it’s a cinematic trailer for the Rise of Skywalker update, and by the looks of it I think it’s Ajan Kloss though I’m not sure if that’s a map in the game.
It is. There’s actually a mod for the PC version of Battlefront II that recolors Takodana to look like Mustafar, with the red sky and all that (https://www.nexusmods.com/starwarsbattlefront22017/mods/2686). Using the cinematic tools could provide some good establishing shots. Anything involving in-game characters will stick out, but the trees and everything else look good.