That statement is false.

Take Factor for example. It has been hosted at several conferences, has an active community of users, and has an academic paper published in ACM.

http://factorcode.org/littledan/dls.pdf

Perhaps what you meant to say is that no citations exist that meet your own apparently arbitrary standards of approval?

Edit:

It appears that it was another individual who recommended wiki/Factor for deletion. I apologize for my inaccurate accusation, but in my opinion that still does not excuse recommending the removal of Nemerle.

Ouch, this is really sad because it took me ~10 seconds on Google Scholar and I found the Nemerle papers. I'm on your side too (if a language seriously has no users and no publications, why have an article on it), but your research skills are giving us grad students a bad name ;)

One suggestion I'd make (following up on my directing you to WP:POINT on your talk page) would be to research the history of Improv's famous spree, wherein he speedy-deleted a bunch of articles on different brands of cookies. You may learn some useful things about when to be strict on policy and when not to.