This usually isn't a 7.62 mm round, of course, but one which is chosen for a combination of flat trajectory and killing power at great distance. But sighting 35 feet high doesn't seem correct at 800 yards with a 7.62 NATO round!
The sighting computers which some high tech snipers carry also have correction tables for wind speed and direction. As I understand it, they even correct for barometric pressure and humidity when they are going for a really long kill. (For the longest shots, there is also a correction required for the spin of the bullet, which tends to make the bullet veer as it spins through the atmosphere.)
With a strong enough wind, I guess that 53 ft. of windage correction is plausible, but the 35 ft. hold over is ridiculous for that weapon.
Also, note that the sniper talks about having the guy in the crosshairs all the time. Sorry, but he states that he is holding 53 ft x 35 ft off the guy, so he wouldn't be in the crosshairs.
Maybe they were testing the gullability factor of the writer. I don't think these were "one in a million" shots, even though they demonstrate the art and science of long range shooting.