They got to see the staff play a demo, not just a video ;)
You should have tried to get there, since there was a demo available for the gamers pass people as well.
It was a real one (there was even a hard crash in one of the showings. Different plays had slight variations as well, so it was not completely pre-scripted. the game even managed to surprise the staff ;)
I recommend the easy allies recap, and yon yeah if you don't mind his controversial channel direction chooices.
It's all on our Fixer's front post, but for convenience:
https://www.twitch.tv/videos/437861962 (CP starts at 1:30:00 mark)
and
Let yourself get engulfed by the warm and fuzzy feelings of cyberpunk
edit : damn i am slow to create my posts... beaten
anyway, it must have been sooo funny having them search for the save in order to resume the demo ;)