Is it alright if it's not actually 84,32 or whatever it is, but all objects are scaled up, so it appears as 84,32 (or whatever it is), sorry if I didn't explain it well.
It is fine to scale. The rule is trying to expressing that you have 84x48 rows and columns of detail. The game resolution does not matter as long as you could make a grid of 84x48 and everything lines up without extra pixels poking out.
I made a reference picture of a 84x48 and 840x480 text. Both are legal the small one is just really hard to read on a 4k monitor.
