It is an automated anti-SPAM function. It can be triggered from various things, like certain Keywords or links. I see one of those posts mentions Ad-Aware, that is probably what triggered it on that topic.
You don't have to get approved by a full-fledged Mod, one of the Ubers can do it also. But I'm not sure if they get direct notices about them or not, and since this is posted in a non-english section, they might not happen across it normally....so if it sits there in quarantine for too long, maybe PM one of the Mods or Uberevangelists about it.