Given it is a red bull production, with few other big name sponsors involved, my guess is they had 2-5 of everything including helicopters and drones. I thought I saw Benny Marr was a drone pilot in another film. With that canyon if there was a helicopter that close in some of those shots they would have been blown off the wall or at least see the choppers impact.
Also agree that they extract options might have been dramatized, but have no doubt they were in deep with little options for most of that trip. Good for them to build up the drama, holy shit that looked epic.
I thought I had foot rot once, I didn't.