He's saying that since the issue doesn't affect many people it didn't get found right away. It is a serious security problem for businesses that use Mac OS X with LDAP. However, it's not a serious security problem for me.
> This looks both real and a pretty serious issue (I wonder how it went by almost a month without getting picked up by the security community).
Followed by:
> Not many people in the security community use Mac servers in such a way that they need LDAP, and of those people, very few are running Lion on their servers.
Therefore, we see that Mr. Ptacek thinks "it went by almost a month without getting picked up by the security community" because "Not many people in the security community use Mac servers".