By the definition of "not human" of course they are. I'm a bit confused, though. The front page of that site does say: "Alien Species Wiki is a website containing information on any alien creature ever imagined by mankind", but then says: "However, we do not allow fanon here, but instead we encourage users to add their fanon to one of our our sister projects, Extraterrestrial Fanon Wiki, Alien Fanon Wiki or Multiverses wiki (more discriminating), which are specialized in dealing with it." Bold in original but kept for emphasis. So that might imply aliens from other fictional dimensions, rather than fictional planets in our own, aren't supposed to go on that wiki.
But that's for them to decide (also kind of sounds like only "fanon" or fanfic aliens would go on the other site, but Matoran would be allowed because they're from LEGO). Simple answer is still yes, Matoran are (artificial) aliens. Artificial life made by aliens, specifically.
Edited by bonesiii, Jan 06 2014 - 08:26 AM.