Neptun will make certain modules, and parts for ships being built in Papeburg. My only question is if that is the Wish engine module or is it a module meant for another ship being built in Papenburg. I've seen the same module/video but I thought I saw I the press section it was meant for an Aida ship. I just havent had 10 minutes on my laptop to trace the timelines to see who it belongs to.
To answer your next question there is a good chance that they are cutting and welding for the Wish. Just the ceremonies have been postponed for now.
Now putting that aside for a minute, when MW Papenburg builds a ship, they have several options available to them. In the past, they have built ships from beginning to end in Papenburg. They have also used Neptun to build certain sections and decorative pieces like the funnel shroud, exhaust housings etc.One of the ships currently being built, had its engine room section floated in from the staging area, after I think the latest Aida or Iona ship was floated out It could be busy work for Neptun if they have no orders of their own, or could be a deadline issue where using Neptun to build a portion of the ship,works to get the ship out on time. But the bulk of the work is done at Papenburg.