The best use of the 65 MOA ring I've seen is as a range estimation tool. 65 MOA = ~5'5" at 100 yds (or meters? i'm so confused)... which is about the average height of a man, give or take a few inches here or there. ;)
So a person about the size, head to foot, of the ring is about 100 yds away, half the size (from the dot to the edge of the ring) is 200 yds away, etc. If you know the height of certain vehicles, you can use it to range vehicles too, as well as buildings (average story is ~12', which is 2 of the eotech rings stacked at 100m, give or take. So if a story is the size of your ring, then it's about 200m away, etc.)
It's also a little helpful in leading moving targets. And it makes target acquisition pretty quick in close ranges, but I've never seen a difference between it and an aimpoint.
Guessing he uses a 1-4x short dot type optic.