If you are referring to 360 YouTube videos. YouTube changed how they deliver 360 video.
The cabinet is designed to use any content delivered in full 360x180 Equirectangular format.
YouTube changed it to a 3 x 2 cube map and obfuscated the source behind a projected viewer interface.

Any content presented in full 360x180 will still work on these cabinets. (even with stereoscopic 180, these screens work as a monoscopic viewer.)

EDIT: confirmed it with the developer, spherical screen is the only one of the spherical screens that are default in Redux right now. The fact that the others have thumbnails threw me off.

Well that's unfortunate, as the one included in the game doesn't seem to do 360 video, only the standard view you get with the video preview. Only the standard spherical one is in by default. The old mod has a crystal ball that isn't in the base. Didn't see any other change from that one.

I believe all four spherical cabinets have been integrated into the base Redux game. This one is labeled "spherical screen" during cabinet selection. I'll mark this workshop item as depreciated.

This doesn't seem to be working on a fresh install. It doesn't show up as a cabinet and doesn't seem to change anything in game when subbed to. The old version at least creates a cabinet option, but the spherical screen seems to just be the default skinned sphere, not a 360 view.

Yeah a few channels seem to adhere to youtube's 16:9 recommendation. The majority of live action sphericals are uploaded in their original 2:1 ratios. AnarchyArcade is an edge case where the ratio matters for these kinds of videos.

Actually some videos don't have that black, like this one. https://www.youtube.com/watch?v=LD4XfM2TZ2k

Yea sorry about the "black holes" on youtube videos. It's the Youtube player, not the UV mapping. Viewing spherical images doesn't have that problem.

I like it! It works well with Youtube 360!