The $35 is a broad estimate. Since those notes would have been done across different time. So the kick in on oil prices are different for different notes. Also depending on the structure I suspect many of them might only be observed closer to maturity, which usually for the korean notes are between 2 to 3 years.
The impact, however, is very skewed market positioning of risk due to all the kick ins of the notes. Might mean better trading positions as investment banks will be able to go long on oil as a natural hedge against the notes.