Of course MS ain't gonna talk about that.
If there were bottlenecks somewhere, an "insider" or a dev would have leaked this anonymously already. The dev kits are in the hands of loads of devs in loads of studios. Easy to leak if problems exist without it coming back on you... Get a clue.
Maybe they have, but you don't want to hear it.
Devs with both, have spoken about PS5 having no bottlenecks, where are the comments regarding the series X
But there's little point arguing, we have a video here with the game paused showing the series X pushing 60FPS with RT and constantly over 40 besides one section, yet in gameplay it drops down consistently more than PS5, and has bigger drops when it does go.
Tools are obviously working fine as in photo mode the theoretical advantage in RT performance is pretty much exactly where it should be. (despite there's being clear differences - I doubt these effect performance much)
So if there's no bottlenecks, you would expect Series X to hold this advantage during gameplay. It doesn't.
Something on the Series X is costing the system 20~30 fps in this game during gameplay which isn't happening on the PS5. If that's not evidence of a bottleneck to you then I would like to see your suggestion.