These fixes were not available in the original. What you are experiencing is altered and is not at all what people are talking about when it comes to preservation.
For most people this is ok, but when we're talking about preservation it's the ability to play the game as it existed at that time with no barriers, and not something upscaled to 4k with widescreen patches and framerate changes to make it feel like a modern game with blocky aesthetics.
I'm not talking about fixes or alterations. I'm talking about running an exact copy of the ROM, to play exactly as it did on the console it was released for.
Unintended emulation inaccuracies are a different matter, but (1) they are addressed with 1:1 hardware emulation (if you so wish), (2) where you don't want that (for the sake of speed, say) the fixes are only there to make the game run as it did anyway
For most people this is ok, but when we're talking about preservation it's the ability to play the game as it existed at that time with no barriers, and not something upscaled to 4k with widescreen patches and framerate changes to make it feel like a modern game with blocky aesthetics.