The instructor let this person fly when he was lacking such a basic skill, and that the instructor came from the same system that allowed this incompetent pilot to attain command of a large airliner. This to me indicates that the system is broken and there's no reason to think it couldn't produce an instructor who was also completely useless at performing a visual approach.
The weather was as good as it gets. Anyone that had experience with "landing a plane", not pressing buttons like the modern cockpits encourage you to do would have landed it safely.
There have been some complaints about pilots from Korea (of course, not only them, but there are some structural problems in Korea that help this) not having good manual flight experience.