I mean, it’s a vision. It can be different than what actually happened. We never see Rey actually sit on the throne, but we see it in the vision. It’s cool imagery that makes you think about what it means. Maybe making the Sith eyes much more prominent in this one shot might be helpful since it goes by pretty quickly.
And I do think Spence’s idea of hearing faintly Luke say, “-straight to the dark” might hammer the idea home.