I see you didnt pay full attention to what he said, in GT the game simulates sound in cockpit from the drivers perspective so audio is dampened by the helmet. On top of that there is a audio change upon entering the tunnel especially the second tunnel. You can quite clearly hear the reverb. Also to add unless you have windows open in a car driving in a tunnel the noise you hear doesnt really change much. I've been in Nissan skylines and Mitsubishi evos with fat exhausts and huge turbos. The noise really only changes in cockpit when windows are down. Just with any other GT game the audio changes depending on what camera you use and you will get significantly more tunnel reverb in chase cam.of course it looks much sharper and cleaner, its native 4k instead of the checkerboard 1800p you are playing on pro.
now, about sound, I really dont think I need to go into it for too much.
you are saying that it is normal to not have change in acoustics when you enter or exit a tunnel, at full throttle, in race car. ok.
lets just say that this is your opinion, and it is much different than mine.
lastly, about "how do I know there is no ray tracing during the gameplay segment", this is very easy: I use my eyes, and I trust them.
You can go ask nx gamer or digital foundry about this if you don't trust yours.
Car showroom, garage, trailers, yes, ray tracing was there. in-game, nope, zero.
Just because it may not sound bombastic doesnt mean it's not realistic. Lots of games over exaggerate car sounds forza does this with alot of its cars the Mazda mx5 being a notorious one in forza 7 sounds like the thing has a LS swap when in fact it has a 1.5litre engine.
Not to mention the indirect lighting in 7 far improved over sport. Areas that are hidden in darkness in sport are much more realistically lit in 7 via the light bouncing around the cockpit.