Yeah like you don't need to use the 2011 Wii U demo tech to make a more realistic looking Ocarina remake, nor would using the BOTW/TOTK engine mean it would look like those games.
If it's made in-house by Nintendo I can see them using an enhanced version of the BOTW engine with next gen tech built into it, while if they've gotten an external partner on board for it, it'll probably be Unreal.








