Thread:Gsimenas/@comment-6697950-20130319140815/@comment-4875978-20130416124039

He actualy wrote them, they were part of volume 2 side stories in the web novel, but were edited in the LN to enhance Kirito's relatioship with Asuna and avoid transforming SAO into the harem genre.

EDIT: that why I haven't added that info to the wiki