That is all to do with the alternative translation of Lucifer as "Morning Star" (Venus) isn't it? I think that Jesus referred to himself like that somewhere (sorry, I don't know where (and I might be wrong)).
Why is Lucifer still used as a title of Christ in the Easter Vigil in the Catholic Church’s Latin Mass?
thecatholicdetective.tumblr.com/post/92117137525/eastervigil