There are so many convoluted and contradictory statements saying YouTube isn’t on the newest version of AppleTV or It is but very janky. So does the regular YouTube app work on the newest version of AppleTV and AppleTVOS with the YTPremium benefits??
Yes. The YouTube app isn’t great, but that’s true across all platforms. You can play 4K videos with the YouTube app on Apple TV, including HDR I believe.