You can argue that the model has access to that tool through the harness the same way your brain has access to see this comment through your body (your eyes specifically).

Sure, but given the situation and audience of this talk, I think they should be more precise with how they word these things. If you watch the video you'll see what I mean. He talks like they have no control over what they give to the model, because the model simply "has access" by default, which is not true.