@amprew A different type of Screen Space Reflection combined with a modified shader imitating a mirror (in a basic explanation). If you stop your car next to a rain puddle and rotate the camera you can notice car's reflection lags while rotating to adjust to the correct angle of the camera.
You can't have a real RayTracing thingy with some additional tools, that feature is being a part of the game's code and engine to work which is far beyond the capabilities of both ENB and ReShade ..