Deletion of Twin (windowing system)

Comment: voting ''neutral'' seemed too lame in an AfD) The only  source is that Brave GNU World issue, which is tethering on self-published, although the column was republished in print (see Georg C. F. Greve). There's virtually no other commentary about twin anywhere, except this http://jjinux.blogspot.com/2006/07/linux-twin.html blog
Stance: keep
Cited policy: Wikipedia:No original research (WP:SECONDARY)