I reject this interpretation (and it is nothing more than that, since there's no ISO definition of NOS). It would never survive the scrutiny of the sort of people who worry about the date codes stamped on the back sides of locknuts.

Give me an example where "old" in NOS means one day old. Or another, other than this one, where an item accepted as NOS or "authentic" was newly produced by someone other than the manufacturer who designed/sold it under their marque. If someone bought the original tooling used to produce Campagnolo large flange hubs, say, and started producing them for sale, nobody in the aforementioned community would call them NOS, though a seller might who perceived a sales/pricing advantage, or who doesn't know any better. There's an expectation that the item was produced by the original manufacturer, using the same materials, processes, and quality standards/control, and in the same time frame, as other products from a manufacturer -- that items were produced by and sold through the original manufacturer. If that's not the case, then they may be serviceable, they may be virtually indistinguishable from and even better than the original items, but they aren't NOS. To support your interpretation leads us down the snake-infested road of caveat emptor, where we'll only find ourselves looking for another term that means really NOS.

Or was your post ironic?