I'm not wrong they forked the engine and it's the same studio that worked with the same engine before, id tech is made for fps it's clear.

A lot of unreal engine games also fork the engine. If your bar is being forked then unreal doesn’t meet the bar for a lot of people either.

3D Engines of that fidelity are rarely genre specific. Editors might be but the engines are often fairly flexible because most genres share a lot in 3D space.