This is a good guess. Secrets are a boundary, but they lost me by calling secrets the boundary.

Even when taken to the extreme of someone knowing every configuration of every relevant atom of the past, present, and future universe, I struggle to see how I'd lose my sense of self. I'd be even more self-conscious, hyper aware of how I might be distinguishing myself, but that's the exact opposite of what they're saying. Unless, self-consciousness is a source of conformity, but I think the inverse is true.