I'm surprised that the store let you buy it for a character that already completed the story. They started to crack down on that type of thing. The skips aren't meant to be a workaround for the parts that you don't enjoy if you've already done the whole MSQ for that expansion. You can't skip something that you have already done. It's meant to be a catch up. The aether currents being done is probably part of a story skip as an assumption that you would have gone and gotten them while going through 5.0.