We are getting reports of YouTube rolling out an experiment to some accounts where normal videos only have DRM formats available on the tv (TVHTML5) Innertube client.
This is not limited to yt-dlp. Tests have been run with the same account on various official YouTube TV clients (PS3, web browser, apple tv) and they are also only getting DRM formats for videos.
We live in hell-world.
With yt-dlp you can DL the videos at lower resolution / quality, so that at least you can have one offline working copy in the meantime.