I think it means that they can only handle making a certain amount of shoes in a certain amount of time, so it doesn't mean that they won't make anymore ever, it just means that they can't take anymore orders for that shoe at that time.
by the way, it happened to me too. :(
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Yeah, I've had a pair in my locker on there for awhile now, last couple of days I've tried to buy em and got the same message