Those aren’t screens in the second pic, they’re windows. They’d insert a starfield behind him in post.
I know they are windows. i was talking about the screens set up outside. They used Hires screen for many of the background elements instead of solely replying on green screen. But, if this was an actual filming session either the screen would be turned on or there would be a green screen. You would not film with a grey background because it would be ridiculous to do so if you needed to insert a background.