Teikoku Kagekidan

Um... As far as I can tell, the idea is conveyed very clearly and visually.

The idea might be present in the song. Perhaps there isn't an idea in the song, but only a leading theme, but we're not talking about that now; we're talking about the video. Considering the video as an independent and complete work of art, we perceive it as a certain unified system that can be visually and acoustically perceived, formed around an idea, a message that the author strives to convey, and each note and each frame serves this idea of the work, already taking into account aesthetic requirements. Here, I don't see any author's position or self-expression.
We can understand the video differently. And then we consider the artistic value of the video and audio sequences separately. As I said, this value is not very high in my opinion.