It's great that they actually stayed with the descent through the programme, often on "highlights" all you get is the climbs and a few bits, plus a finish. This just shows the skills involved in winning races, not just strength but courage and high technical ability. Which is why some people can gain a minute or more descending.
Having also done a few seasons as a moto-pilot, after stopping the racing, I can only sit back and admire the levels of ability demonstrated. You get to know your cameraman, and trust is an essential part of the job. I guess that team know each other very well indeed! Not work for tha faint hearted..