I don’t think screen specifically means TV, I think he’s talking about the original works like the games, tv shows, movies, being in first place, as opposed to material that comes with those original works, like instruction manuals, press releases, which is a second priority in terms of what canon is, and then Q&A sessions or, and this is when I’m also confused, spin off games.
Now, if spin off games means things like fallout shelter, sure. If spinoff means New vegas or Fallout 76 , that would be more surprising to me.
I need to watch the source video to know better, but life.
EDIT : nah, it seems he means gimmicky tie ins like fallout shelter.