You know, the tale of Genji does have stuff about romantic and political maneuvers and whatever, but I'm fairly certain the part that they were referring to is the very famous and contextually relevant part where he raised a young girl from the age of 10 to be his wife. You know, kind of like...
You know, this is a ten times nicer confession with words that fit his personality, that show why he loves her, that go perfectly with the events of the story itself. It's less rabidly excessive and more sweet and genuine and loving.