After looking through it quickly it seems to do the same as most profanity checks with Dutch: it doesn't block "kut" (a crude word for female genitalia) but it does block "kunt" (third person form of "can")
Ah, that's right—need to have had an account for four days and... to have clicked the 'Edit' button at least once?
That's what the linked page says (I'm not familiar with Dutch Wikipedia specifics), but that seems like such a strange statistic to track instead of minimum edit count.
So weird that I looked up how to configure MediaWiki autoconfirm requirements. They probably mean a minimum of one edit. Auto-confirmation considers only age and edit count, and I don't see why clicking 'Edit' is so meaningful a condition to warrant developing an extension.
