The youtube video covering it has an interesting run through of the desktop environment in the final section https://www.youtube.com/watch?v=eGS9su_inBY&t=2418s. But I agree a screenshot or two wouldn't hurt.

That video is very annoying and doesn't in any way replace just having a screenshot of it running.

Tinfoil Hat Take: Avoiding screenshots on the project page drives eyeballs to YouTube, which the provides ad revenue, which then feeds back into the project.

Or it might just be a sign of the times. Many folks seem to prefer video as a way to convey and use information.