What he is saying is that Wikipedia can, and often does, delete real articles about real Amiga products that really exist and are used by real people in the real world because "The Amiga is not notable".
Yet articles about every random fictional TV show starring fictional characters performing fictional deeds in fictional locations, are not allowed to be deleted because they are "notable for being mentioned in the mainstream media".
Any "encyclopedia" that deletes factual information but keeps fictional information is a joke.