Apple no longer sells it, so it is discontinued; it was pulled when the M3 hit the market.
Neither of us knows if Apple is still making them. They may simply be finishing the run. If Apple were too continue making them I would have expected rumors to start, based on parts orders and manufacturing plans, to have circulated before teh announcement.
In addition, since Costco is OOS it makes more sense to me as a stock clearing move.
While the machine may be new, it's not an item Apple currently stocks; hence NOS.
In the end, however, it's just semantics. The buyers are getting a great machine at a great price.
I'm not so confident. A press release makes the news, and Walmart didn't announce a new strategic partnership with Apple in the release.
It will be inetersting to see how long this lasts. I suspect Apple's other big channels such as Best Buy would not be related happy with Walmart selling a significantly cheaper MBA; and that they don't have the same deal makes me lean more towards dumping stock rather than a strategic product shift.