The problem here is that the video is on Korea time. What it says in the video description about "the story of the hero(es) being spread" (영웅의 *********야기가 전파된다) are almost exactly the words that Chief Developer Nam Taek-lim uses to describe the lore content of Episodion (영웅들의 *********야기로 전개하고자 합니다; in that version the heroes are explicitly in plural): http://lineage2.plaync.co.kr/board/l2online/view?articleId=540416
(above the sign that says "No entry for dark and gloomy Goddesses of Destruction")
This is so-to-speak a dual-use video. For the Koreans it refers to Episodion, but when you leave away the text it can as well refer to Lindvior :)
Yeah I agree with this part. Anyway I am still happy to see such materials, especially released at the same time in Korea and in the US but with different meanings :D