What happened was that I recently added the "unused content left in the game files" to the Manual of Style to go along with the Allusions section standardization project to help people organize things better. Unused content is very much part of a subject's development, and Toby and the developers occasionally mention unused content in the newsletters, posts, and social media.
Sans's ice cream scene would have been a Trivia point if it was left over, which wouldn't make sense when it was mentioned in a newsletter. Ralsei and the Knight have unused content for a battle, or ideas, and they would have been out-of-place as a Trivia point too.