If I'm not misinterpreting, the post you're replying to wasn't claiming that a general aggregation in principle was the same as individualized statistics, but r

If I'm not misinterpreting, the post you're replying to wasn't claiming that a general aggregation in principle was the same as individualized statistics, but rather saying that Amazon's definition of "aggregation" effectively mooted the normal argument for it. In particular that last bit, where Amazon would count it as "aggregated" even if the only "other seller" were Amazon themselves in the form of reselling returned/damaged/refurbed goods. In practice that would probably be pretty close to having individualized analysis generally available, if not identical (because employees could separately get Amazon Warehouse Deals alone, since that's "in house", and then simply delete it from the "aggregated" sales and have both).