You really probably have to peel anything off you can, skim coat the areas that pulled off with mud and prime the whole wall. Someone else mentioned stix which imo is the best primer. You could also use all prime which is a clear primer that works well on drywall where the paper has come off leaving a rough brown texture. If you mud over that without using all prime your mud is likely to crack and bubble.

Stix is the best, especially for cabinets or other overpaint items.

Diablo, torchlight, stardew valley

It definitely looks like it, but I didn’t want to assume. It’s still not the blue pool however.. great pic of a very special area.

Not blue pool, but looks like the McKenzie river. Love that hike.