SK is not correct on the summary listing. You get 25% on the cheap booking classes.
I did notice that the cheapest SK flight IAD-CPH is in Q class in September. They have W fares now in the summer (good luck finding one) but you can get a V for $100 more, which is 6000 EQM for $100 or a pretty good idea.
One could surmise that the target of this scheme is the fare structure that is used to compete with LCCs. This does not yet exist in the transatlantic market.