Doesn't it always say, "Screen free from damage?"I don’t think the trade in criteria mentioned scratches, and the one I sent in had several.
Yes, as others mentioned should be fine. I remember reading somewhere that the practical way to figure out if the scratch is "surface-level" or not is to run your fingernail over it. If your nail catches on the scratch, then it's actually indented, and is considered damage. If your nail just goes over the scratch smoothly as if it wasn't there, it's just on the oleophobic coating, and no issues.
The language specifying the physical condition of a trade-in differs between the standard trade-in offering and iUP.
Standard trade-in: “It turns on and functions normally. All the buttons work. The cameras work. The body is free of dents and scratches. The touchscreen and back glass are undamaged.”
IUP: “It must (i) power on and hold a charge; (ii) have an intact and functioning display; and (iii) cannot have any breaks or cracks.”
Note that the IUP language does not mention scratches. My IUP trade-ins have had multiple deep (can feel with fingernail) scratches the past 2 years and both have been accepted without issue.