Perhaps this misunderstanding may not have been specifically corrected before, but it should be: How can someone be "absent without leave" when you don't need leave to be absent? We're volunteers, not press gangs!
And there's one new misunderstanding. You seem to think each category of the directory is like an assembly line -- one site reviewed and added every 4.752 days. But it's not like that, not at all.
The focus isn't on reviewing submittals (that may have been mentioned once or twice before). It isn't really even on reviewing sites (although that is obviously necessary), but on building the directory. In practice that means building _categories_.
So the usual mode of editing is to select a CATEGORY that needs work, and work on it. That might entail creating links and subcategories, moving sites out, fixing bad descriptions (yes, we have had them....), removing broken sites, looking for, reviewing, and maybe even adding sites. A lot of work might get done in one or more sessions over a short time (several days). Then the editor goes to another area to work. That one category might not be revisited for months. Does that mean any editor is AWOL? Of course not (though some editors, we don't know which, may have gone inactive).
On the other hand, the editorial activity which you want so much to happen (reviewing submittals) can chew up a lot of editors' time without having any effect at all on the visible number.
If you'd read some of the other recent threads, you'd have seen independent proof of it. One submitter complained that "no new sites had been listed in his category since 2003" but mentioned in passing that "he'd seen editor visits in his logs every two weeks ago." Well, obviously some editor (not "THE EDITOR", which, as has been mentioned, isn't a concept that the ODP has!) had been checking that category's unreviewed queue regularly, even though there was no visible effect THERE. (The only visible effect was elsewhere, since many mis-submitted sites were being moved to the correct category where they could be reviewed for a listing.)