ampan
The point is that it was possible for a pilot attending the briefing to leave with the impression that the track was direct to McMurdo Station, and that this track would take the aircraft down the middle of McMurdo Sound, with Ross Island to the left.
Not so. That idea is flatly contradicted by the discussions about having to make a left turn from the waypoint in McMurdo Sound, then estimating the track and distance required to get to McMurdo Station.
The briefed track was not direct to McMurdo Station, regardless of how much you or the airline wish it were so.