I can understand why you're paranoid haha, but this code only unlocks the trophies in the game specifically, and doesnt do anything outside the game other than that. The galleries in the game requires the user to achieve specific trophies for gallery unlock, and these codes only changes the values, so they are unlocked. In short:
- Each trophy = a registry value
- Value name = trophy ID
- Value data = date/time unlocked
- Empty hex: values = locked trophies
So when the game sees that the trophies exists, it automatically unlocks the gallery.
Hope that explained it for you, and have a nice day