Just wanted to make a note, just so nobody freaks out if they start loosing more feathers than expected, that you can probably expect it to be a little less downproof than your test when used in a quilt or something.
My experience has shown that when tightly stuffed like the pillow in the test there, the loss is much less likely than in a scenario where you stuffing based on fill power where you don't want to over compress.
I'm not saying it's not downproof, I'm just giving a little fyi. I'm sure it'll be perfectly functional. Just probably on par with first gen EB Downlight jacket's fabrics. You'd have to be loosing a *TON* of feathers every use for it to ever add up enough to matter.
It should have used approx 8.4g to stuff to 2" thickness, assuming that's how tall the side panel is. Obviously that wouldn't work for a pillow (although high fill power down is really not very good for this application), but it's not going to convey an accurate representation of downproofness, because you've got many times more than the usual amount of compression keeping it packed tightly together.
I know this may sound counter-intuitive, but that's just been my observation. I've actually made a pillow out of entirely non-downproof fabrics before with high fp down and had minimal loss due to this phenomenon.