As for 'better than the real thing' : Is "sharper" always 'better' ?
I'm not so sure. On plenty of visual media, 'sharpening' is often added but for me it reduces quality. Obviously so, since you are modifying the original source to create an illusion of clarity - but sharpening is not making things more clear. Nor is FSR. It replaces actual data with guesses and adds sharpening.
If the creator (the game studio) did not want the image to be super-sharp, are you improving it or degrading it when you 'enforce' sharpening? On the other hard, if the creator failed to get a image as sharp as they really wanted - one could argue you are now adding quality.
Sort of similar, you can turn up the treble and bass to music, and many will say it sounds better. But it is now a less correct representation of the original.
So how do we define "better"? Is it simply what people like? Or is it reproducing imagery as close to the creators intent?
It would be interesting to hear from the creators of Deathloop, what they think of the result. If they could say so without being afraid of AMD.