I don't understand how these are mutually exclusive. Why should it being emergent mean it's absolutely impossible to move it out of the brain? Of course it cou

I don't understand how these are mutually exclusive. Why should it being emergent mean it's absolutely impossible to move it out of the brain? Of course it could turn out to be impossible in practice for some reason or another, or it may not happen for thousands of years, but I don't see any theoretical reason that makes it impossible a priori.