Yes, you're right that your question wasn't a duplicate of the linked question, because you already enabled the repositories that provide "ddeb" debug symbol packages (the
-dbgsym packages), and both answers to the linked question were just about doing that. Fortunately, Seth has reopened your question.
Anyway, regarding the matter of moderators closing questions:
Your question has been reopened by a moderator, but no moderator was involved in closing it.
Although I do agree that moderators should be very careful when closing questions, as Fabby mentioned most questions are not closed by moderators. In fact, it is our ability as regular users to cast close and reopen votes that makes it possible for moderators to use a light touch and only use their very powerful close and reopen votes in cases that are especially uncontroversial or especially urgent or important. Non-moderators with at least 3000 rep can vote to close and reopen questions. Your question was closed by five regular (non-moderator) close votes.
The other question you mentioned indirectly here, in that it was the subject of the meta post you linked to, was not really a case of moderators being overly quick to use their extra-powerful close votes, either. Although one of the users who voted to close that question is a moderator--and was one at the time--his close vote was no more powerful than anyone else's in that particular case, because it was the fifth close vote. Four non-moderators had already voted to close the question (and their close votes were still in place, having not yet aged away).
None of this is to say that we don't wrongly close questions way more than ought to be considered acceptable. In fact, I even participated in a clearly mistaken closure recently! (Sorry about that.) I'm not a moderator, though. Most users who are involved in "moderation" actions aren't.