The idea that "it wouldn't be you" isn't something I thought would be a problem

It probably doesn't help that Celestia implies "it wouldn't be you" when explaining why Hanna uploaded. If the shut-down authority was tied to her biological body, then Celestia fails to say so, and talks instead about identity. If it was tied to her name, then conflating that with the uploading is misleading. If the point of uploading was to protect her against coercion, then that would be sufficient even without any change in authority, and "Hanna no longer exists" / "Now that she is not Hanna" are misleading. Either way, I endorse the pattern theory of identity, but I don't see any plausible way to interpret that exchange in support of it.