I was able to talk my way in, take the general non combat approach, then I assassinated Minthara, no one saw, everything's fine. I go around the camp exploring, I find another Goblin leader and kill them. Still no issues.. I take out a few sleeping Goblins and no one sees. Eventually I make my way to the leader Ragzlin, who is surrounded by goblins, but in anticipation of them running for help, I scope out the place, find all within visible range, then assassinate them turn one of combat in a surprise round, then proceed to yeet the leader to the spiders and annihilate him.
Despite no one seeing me do any of this, all of the goblins are now aggressive to me. No one has discovered any bodies, etc.
I hope this is not intended, that once killing Ragzling the whole camp turns aggressive.. I would like to be able to get in and kill them all one by one sneakily.