Haven't notices variable speed limits not having a NSL display at the end on the ones I have used.
However I always believed that, in the absence of repeaters on an unlit road the speed limit is whatever NSL would normally apply to that kind of road, so the OP could well be right on that basis that it would revert to 70 if a variable limit on an unlit motorway did not have a NSL sign.
But then I could be wrong
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