Question about Treasure of the Midnight Isles

Hello all,

First playthough, and using my Steam Deck so no mods.

I did the Midnight Isles DLC during Chapter 3, and it brought me from level 11 to 13. I very much enjoyed it (outside the aging mechanic which was bleh).

Now I'm in Chapter 4, and have come across the helmsman again

He looks like he'll send me to the same first DLC area. Does this mean that if I went to do it again, it would be the same exact playthough again? Now that I'm level 16, would it still be the same enemies that I fought at level 11? And would I get the same loot?

Or would it all be empty because I killed everything the first time around?

Thanks!