Technically this article is about NorwegianAir International, not Norwegian Air Shuttle ( the parent company which operates 737s to Dublin ).
They are two distinct legal entities; employees cannot transfer between then without resigning from one.
Here's the break-out of Norwegian's intricate web of companies:
https://www.norwegian.com/uk/about-n.../organization/
Norwegian Air International is the Ireland-based company that would damp-lease the 787s back to Norwegian Long Haul. I think that's how it's structured...