That's a valid concern. There is no intention of excluding something like a proper case hacks, typo corrections, or complete text re-invigoration. That clause was intended for submitted hacks that only change a few words, or replace a character's name throughout the game with 'vivify93', or changing Mario to blue for no reason, or replacing Mario with a one frame glitched rectangle sprite, etc. There must be a clause that prevents such hacks. People try and submit all kinds of junk daily. Sadly, the noise ratio is high enough already.Examples would probably be the best way to clearly express what you're aiming for.
The idea is such hacks simply need to substantiate themselves in the description. That can be done by noting reasonable necessity for having the trivial hack, or explanation of any non-trivial nature of the hack. It's not intended to widen the scope of exclusion, rather rephrasing existing exclusion. Do you have a better way of expressing that idea through the guidelines?
"Minor sprite changes, palette edits, text changes, or other seemingly low effort hacks may be viewed as incomplete and/or non-improvements. Descriptions should clearly demonstrate the necessity of, or non-trivial nature of such hacks to avoid unnecessary rejection. Examples: Changing one character or item's name and nothing else, editing only a few pixels of a sprite, palette alterations affecting three or less characters or environmental objects, etc."