I disagree. I think the video clearly described the challenge, somewhere in the middle of the video, as sending TV signals that both BW and color TV sets could

I disagree. I think the video clearly described the challenge, somewhere in the middle of the video, as sending TV signals that both BW and color TV sets could decode, and went on to explain how that challenge was solved by "inventing" separate Luma and Chroma signals. Did I miss something?