To confirm it's not just my save, I removed ll the mods I had, revalidated the game files on Steam and started a brand new game to try it here is a screenshot:

Brand new character who has a neutral relation with the tech hunters and I do not have the option to talk to Nikon who is acting as a shopkeeper in the World's End inn.
EDIT: Silivren mentioned that merchants in hiver villages also cannot be talked to. I can confirm the same happens for me, as well. I again tried it with a new game with no mods just to confirm:

Possibly related: the hiver merchants don't do their usual "run to the player and ask them to trade" thing - they just stay behind the counter.