I have to trust my staff member. If he wants to look at the transcript of an in camera meeting held on a given day, he has to have my permission first. He works for me; I am the person sending him. It's not just anyone. What does it matter if it's someone else? In order to do our job, we need staff and we trust them. That's why we suggested the words “authorized by the member of the Committee”. If the person isn't authorized, then they can't look at the transcript.
If I was working on a file, I could ask a staff member to check the transcript for me. Regardless, if I were to check the transcript myself, I could memorize it and tell my staff about it anyways. There is nothing stopping me from telling my staff about it. So what's the difference? We work together. In camera proceedings don't prevent us from working with our staff.