I'd assume AO is fermenting their blended juice,
Filtering the yeast out of cider,
then backsweetening with the original juice blend to a target gravity.
Sound about right?
That's what I did for my clone recipe.
My angry orchard clone is pretty simple.
I used the concentrate from a black rock cider kit, since it was cheaper than buying apple juice, and produces a great cider.
1. Boil water, and add 2.5 cups sugar per gallon (2kg for five gallons)
2. Pour into carboy
3. Add concentrate
4. Fill with water
5. Mix, allow to cool, and test SG. The goal here is to have a SG of about 1.080 (~10% ABV)
6. Add yeast (I used the black rock kits cider yeast here, but have had good results with ale yeast as well)
7. Allow to ferment 2-3 weeks
8. Rack to secondary and allow to clear.
Here's where my instructions might not be helpful to some of you, though I'm sure you can replicate the cider in your own way
9. Filter cider (I filtered mine twice through #2 filter pads)
10. Mix filtered cider with equal parts pure apple juice (I use sun rype or PC brand. If that's unfamiliar it's because I'm from Canada)
11. Chill cider
12. Force Carbonate
13. Bottle
14. Enjoy
A similar product may be produced by allowing the cider to clear sufficiently, bottle carbing, and pasteurizing, but that's not how I do things. Too many complaints of my ciders being yeasty.
So far this cider has gone over well, and is a close approximation in my opinion.
For those who are interested I use a Buon Vino Mini Jet filitration system, and a Liquid bread carbonation cap with a 5Lb CO2 tank.