Scaling up from the base resolution is completely okay and I would actually recommend it because the resolution is very hard to play on most modern computers.
3 years ago(+2)
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.
