These were recorded in the simulator as stated in the article by Christian. However there is a recording mode on the device itself as well, although as I don't have one I don't know the specifics.
In those reviews it looks like a mix of screen recording (what the user sees), and you can also record and take pictures from the onboard cameras (headset PoV). Thanks to the passthrough, screen recording will often also capture the room and the users hands.
user2344597|2 years ago
ryankrage77|2 years ago
ugh123|2 years ago