The game needs an overall boost in the optimization department to be fair.
What exactly do you mean by “graphics”? Better model fidelity? Better map fidelity? Better effects?
To be fair, that’s because you’re playing in actual HD resolutions as opposed to the original analogue resolutions or downscaled resolutions forced for performance reasons.
Also tflops are kinda useless figures unless you know what that power is being diverted into specifically. The 2013 Xbox One utilizes 6tflops and can barely run this title at 1080p at sub 30fps, my 980ti has the same power and can push 120fps at the same resolution. The Series X is a formidable console, but Halo Infinite is a bizarrely demanding game.