The game engine’s name is Luminous Studio; I don’t know where you took that idea from…
This game is using pieces of Final Fantasy 15’s codebase and a lot of reskinned assets as well, some animations in this FF7 game are also coming from other Luminous engine titles. Basically Squeenix needs to make back the monies they’ve spent in these more than 10 years of FFXV development.
If they use UE4 now, I’m impressed!