It means that these videos are relatively fresh, not old. They are not throwing up an EHOH video from many weeks ago just to manipulate the socials. Stern has two lines currently, expanding to three+ in the new location. That means they are always making multiple game models at once. These shorts typically show one game, so of course it's not a complete account. Also they are not going to show games that are secret, like the Foo Pro models that were made in February for TPF and SXSW, etc.
If you ever make it to Chicago Pinball Expo, you should do the Stern factory tour.