I just noticed that this question is closed as "belongs on meta", but not migrated (I think migration wasn't available at that time). That's not a particularly big problem in this case (there are similar questions around on Meta), but for the general case, should there be more questions of this kind: Is it of any use to flag such a question for mod attention? Can a moderator migrate a question that has already been closed?
They can be.
A moderator can migrate the question by re-opening it and then closing it again for migration. Since diamond moderators can do this with a single vote the process is fairly simple.