Didn't say fire the guy, he is prob qualified to change the toner in the printer and help the users when their mice stop working.. ;) But from a statement like that he shouldn't be in security that is for damn sure..
The other aspect, even if not worried about security issue because of no code, nothing open to the outside… How is he an admin of anything? The code is not current and no longer supported. The OS it based on freebsd is old and out dated 8.3 - and guess what no longer supported.
So even if you had a question on how to do something, or something XYZ not working. Your out of luck.. First thing anyone is going to tell you is get current.. That your not even on the latest version of that branch is disconcerting... 2.1.5 was the last version on that branch..
Go through the release notes for the versions of all the stuff changed and fixed.. And keep in mind release notes are normally just the highlights of stuff fixed, corrected, added.. There normally many other things that do not get mentioned. You would have to look in redmine for all the resolved issues that are fixed in a specific release, etc.