Yes but the point is that KE redemptions are round trip (ie, the number in the chart is the number of miles required for a round trip, unlike for other partners). However, if you use them as half of a round trip, you only get charged half. On the other hand, if you use them for a one-way, you get charged the full (round trip) amount.

The key point from the fine print on the award chart is:

One-way Korean Air award bookings are charged the same number of miles as round-trip travel. Korean Air flights, when used one-way in combination with Alaska Airlines or another partner airline to create a round-trip itinerary (routing restrictions apply), will be charged half the applicable Korean Air round-trip miles. If any part of a round-trip itinerary is flown on Korean Air, it becomes ineligible for any refund of the unflown portions.

This restriction can create issues (1) if you don't want a round trip (maybe you are doing a RTW or a circle trip, or maybe you want to reposition one-way to take advantage of a good fare) or (2) if you want to return on an airline that can't be combined with KE (I was told by a phone agent that CX had to be ticketed separately, and thus a one-way CX award could not be combined with a half-round-trip on KE). But combining with JL should be fine.