Weird, I can get movies to work, as in my screenshot in the above post.
Maybe there are other issues, and that explains the notice from SF.
Maybe others with problems could try, as simchrise says, doing it through Disney+.
I have not tried Hulu through Disney+ lately, as the last time I tried, I never could get 4K from Hulu through Disney+.
For me, using direct movies from the Hulu module works fine and gets 4K fine.
Wish SF would explain the notice.