Could you explain what you mean by this? I'm having trouble parsing "update down your view of".

Aumann's Agreement theorem is a neat true result about fictional entities. Its applicability to real entities is subjective, and based on how close you think the real entities are to the fictional entities. Increasing that distance makes AAT less relevant to how you live your life, and increasing that distance is what I mean by "update down your view of."

My feeling is that those entities are really distant, to the point where AAT should not seriously alter your beliefs. "I trusted X because Y trusted X" is a recipe for disaster if you trust Y because of different domain-specific competence, rather than their deep knowledge of X.