Author here: It's early, and currently resolution is limited primarily by model size. Which drives me nuts. It's one of my top priorities to address because that would be a great improvement. Adding super-resolution to the pipeline should also be pretty easy but I want to at least output a reasonable base resolution on the photos first before I go that route.

Oh yeah to answer your question- super resolution does indeed make up details as you describe there and arguably does blur the line with restoration/story telling. But so does colorization- not all the colors added by the model are going to be what was actually going on there, of course.