The question is getting close to two weeks old (after that it will no longer be displayed in community bulletin, which means that it will be noticed by less userusers than it is now - which also decreases likelihood of getting some feedback) and so far nobody responded - if we do not count a few comments, most of which seem to be related closer to the question linked as an example rather than to the general issue the OP asks about. Let me try to address at least some points raised in the question. Of course, it would be definitely better to get some response from more experienced MathOverflow users. And perhaps also from moderators - since one of your suggestions was to flag for moderator's attention in the situation described in the question. So take this as a response of somebody who has more experience with reopen process and community moderating from other sites. Although MathOverflow is in some aspects unique, at least some things work in the same way as on other sites, so some experience from other sites in the Stack Exchange network is transferable.
Reopen request thread. There is a reopen request thread here on meta. If the question is not reopened through the review queue and you think it should be reopened, it is very reasonable to post an answer there. This can attract attention of other users to the question. And the advantage is that some short discussion is possible in the comments - if other users disagree, they can layout their arguments why the post should not be reopened. (In the reopen review queue the users have to rely on what they see in the commentsquestion and in the questioncomments. In this thread, the case for reopening can be presented more clearly.)