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??
I’ve had several Apple TVs in the house for several years, I’ve always had YT, in fact I sub to Premium as well. While deleting and reinstalling an app can be the way to fix an app, I’ve rarely had to do that. I don’t recall ever having to do that for YT.