Using Wikipedia guidelines to back up Wikipedia guidelines is a logical fallacy via Circular reasoning. 

ELNO - "substantial number of editors" criteria is irrelevant, because an infinite number of monkeys can create "Hamlet" or one person(Shakespeare) can. It would be interesting to know why it was added to EL in the first place.

ELNO - "substantial history of stability" criteria is undefined. The wiki has been stable since inception.

The point in linking to external wikis from any Wiki farm is to help users find information beyond the scope of Wikipedia and that is not available from official sources.

It is also there to provide a place for users to add information that is beyond the scope of Wikipedia, and to foster and grow that information in order to come back and create better articles at Wikipedia.