*shrug* it's possible to call anything apophenia. I could just sit here and say, "hey you people are not seeing the patterns that are there". It's an utterly meaningless statement.
If I pick one specific point to answer:
You're basically flattening all of the nuance in the delivery and the situation. If you asked Eder whether his problem was 'answered' or whether he was given a full 'closure', his lines throughout his entire quest say the opposite. Eder didn't set out to say, "did my brother fight for X or did he fight for Y?" He wanted to know why, he wanted to know what drove his brother, and so on. Your interpretation is basically like saying "you cheated on me, now I want to know whether you kissed him 3 times or 4 times."
Similarly, you find with Sagani that Persoq was the white deer and so on. But again, focusing on that is completely missing the point. Everything Sagani says from the start shows quite clearly that she begins with unquestioned certainty about this ritual practice / journey and she is looking forward to just finding the guy and getting it done, but as time goes by, she begins to wonder what this journey means at all, what it means to Persoq, what it means to her, what it means to her tribe, and whether finding Persoq will really solve anything or answer anything, and what finding Persoq would be able to give to her at all. We find, from all of her lines at that last encounter, that indeed, finding Persoq could give her no answers on what mattered most. The only answer she did get is the answer that matters the least - that Persoq was a white deer.
Of course, if a reader hypothetically went through those quests and thought, "OK we were trying to find out who Eder's bro fought for and who the hell Persoq was, done and done, their stupid problems are solved", then I'm sure the whole thing will feel rather pointless. I would say that's an extremely impoverished reading that ignores most of the nuance in the writing - and under such an impoverished reading, the only type of plot that would feel satisfactory is a highly melodramatic and explicit "here we are saving the world, here look you see this person die right now, can you save her?" and so on. Sure, everything I said here is my interpretation, but I found that the themes were weaved quite indirectly and I enjoyed that 'non-epic' approach.