Quake RT is pathtraced. Path tracing is a type of ray tracing.
https://youtu.be/FewqoJjHR0A https://youtu.be/LAsnQoBUG4Q
Metro Exodus implements ray tracing through global illumination, where light emanates from the sun and the sky, bouncing once to light the game world more naturally than traditional rasterised techniques. This makes a huge difference to outdoor areas, as
simulating rather than
emulating creates new shadows, lights and colours that don't appear when ray tracing is turned off. However, indoor scenes - where the global illumination of the sun and sky aren't simulated - only see the benefit of screen-space ambient occlusion (SSAO) replaced by ray traced ambient occlusion.
Marbles demo is just a RTing demo with physics, performance took a back seat to quality. Control has all the same features. DLSS 2.0 is in this video at the end.
https://youtu.be/NgcYLIvlp_k?t=138