MVG has made a similar video on this previously but this is new, made after the recent outages with that in mind.
tldr:
he tests installing 6 disc based games offline with his series x system being set as the home console
4 smart delivery games (AC Valhalla, Balan Wonderworld, Far Cry 6, Resi 8) = AC, FC6, RE8 can't finish installation however Balan does
1 XB1 game (Crackdown 3) = can't finish installation
1 Series X non smart delivery game (GTA 5) = does finish installation, and also alludes to previous testing that he's made with any non smart delivery series x disc he's tried has also worked
He also theorises that we'll see more discs work offline in the future as we move away from smart delivery.
Lock if old.