when robozilla hits your site, is it because you have submitted to be added to the directory and its finally come around to check your site, or if you already have a site in the directory does it check your site is functioning?
It also checks sites in the queue. You may be visited by robozilla without an actual listing. Like said above it is just checking for 404s and does not include your site. DMOZ inclusion is completely done by human hands.
As windharp says, Robozilla only visits listed sites (so a hit from Robozilla could be seen as a positive signed that you're listed). He may visit sites that are waiting for review in future but at present he does not.
Another ODP-related bot to look out for is 'TulipChain', a Java application run by individual editors for checking listings. This can optionally check submitted sites too.
I don't think Robozilla checks sites in unreviewed, but I suppose there might be some test going on I don't know about. One thing to think about though, I could create my own linkchecker and have it send Robozilla/1.0 as the user agent. Other than through the IP address, there's no way to know if it is the ODP's Robozilla.