The editor you talked to misinformed you (probably unintentionally, but still).
The main editor of this regional directory went for a trip for long time (he left a message at editor forum talking about 8 months - so I learned from other editors), but he did not appointed any substitute.
An editor who leaves does not appoint a substitute. There is no need to do so, and no way of doing so. There are ALWAYS a number of editors who can work in any one category: the editor(s), if any, who are named in the category, any named editors in the parent categories, and all Meta and Editall editors.
That doesn't mean that any of those will work in a given category during a given period of time, but thatis the case whether or not there is an editor named.
The result of this is that many of the categories in the regional directory are not reviewed.
No. Of course if there are NO editors, sites and categories will not be reviewed, but as explained above that is not the case.
This also stops the selection of new editors.
No, it doesn't, and I'm glad you came here so the misunderstanding can be cleared up. Only Meta editors can grant editor rights, and they can all edit in the whole directory. Editors who are not metas cannot select, appoint, remove or in any way change the editor rights of othe editors.
It is as if the directory is paused!
I hope you'll see now that that is not true
If there is a particular category you think has been neglected for a very long time you can always point that out - we always appreciate a heads-up, though we can't promise that anybody will go to it right away.