This commentary is given by Yan Chernikov ("The Cherno") who is a game engine developer. His comments helped me pay attention to a few details that I didn't notice by watching the video without more detailed commentary like this. This video is helpful in adding detail and clarifications to the commentary provided by the authors of the demo. The also talks about how game engine developers and artists work together and how the Unreal Engine 5 can streamline that workflow by enabling the artists to focus on their art without worrying about the implementation aspects as much as before.
It's definitely worth watching if you're into how games are made.
That was really amazing, I feel like I learned so much new things about game engines. =D Thanks for sharing this video!