Not only is @jacksilver@lemmy.world right, but additionally, this article is extremely biased in favor of Xorg and is much more of a (completely unfair and one-sided) take-down of Wayland oriented at technical folks and not at all an explainer for laypeople
My understanding is that it means going, loosely, to the opposite side of the state of the major metropolitan area in that state. Upstate NY is the northwest part, upstate MA is the west part, upstate PA is the northeast part. I’m looking around, and it seems to also 1) only be used on a few states, 2) usually is on the north half (but not always), and 3) is somewhat interchangable with “rural”.