Deletion of Cosmic Extensionalism "X"

Comment: A phrase coined and used exclusively by a single artist.  There is no coverage of the term outside of mentions in articles on that artist, so it does not have the sources to pass the  as a standalone article. And, as pointed out by onel5969, it would not be the appropriate term to use as a Redirect to the artist's page.  I have no objections to Redirects with the correct titles being created, though
Stance: delete
Cited policy: Wikipedia:Notability (WP:GNG)