First off you are comparing 2 images with completely different angle, distance and lighting and than you make this bold claim "The difference is as large as between Scapes and gameplay in GT". GTS scape mode use 3 lods higher lod than the gameplay model and enhances the shadows, textures, tesselation and reflections while even in Forza 7 the Forzavista mode is using 1 lod higher wich the only difference between gameplay lod is the engine details and even then the shadows are lower resolution in Forzavista. And BTW Forza Motorsport 7 already does 4K 60 with massive tracks and 24 cars with weather on XBX. With the power of XSX i expect them to enhance the graphics with ray tracing and have fully dynamic tod and weather. And back to point one, here are examples of that "gameplay part where you didn't see ray tracing"
Look at the inner side of the wing you can see self reflections (the green white are all reflections of the body because the wing itself is just carbon inside, its got even dirt etc)
and here its reflecting a little different from different angle
Here you can also see it very clearly, look at the reflection on the side window you can see the wing reflecting in it and you even see a part of the body (you can also see the wing is just black in the inner part wich proves the images here above)
again the same from little different angle and the same on the other window