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.
https://www.mediawiki.org/wiki/Manual:Autoconfirmed_users
Searching about extensions did lead to discovering an obscure feature: there's now a built-in URL shortener: https://w.wiki/Q8
Edit: interestingly, the single-character ones seem to have been pre-planned: https://w.wiki/e, https://w.wiki/E, https://w.wiki/4