Normally regarding the legitimacy of questions/answers, only questions after or recently before are affected by a reasoning, or at least within a reasonable space of time at the authority's discretion. I don't see a reason why this would be treated differently, the only problem I'm seeing myself is whether they can truly be 'resolved' or not, which makes me question if they can't be excluded from the 'unanswerable questions' clause and all should be hidden under that. Though since these have been going for such a long time now (I know there's been a cluster of them lately, but they've still been around as far as I can remember), I doubt that will happen as a matter of laziness.
TL;DR: Good luck on that one, auth :P