That was my first idea and when i found out the video url i was quite pleased to figure out the solution.
Then the "generated" folder made me think, and i decided to test it a bit more, so i started the experience at 15:00 and 35 seconds, just the right amount to get to the time reveal just after the clock change, and i was blown away, the video shows 15:01 and not 15:00 as i expected, whatever they are doing here to replace the video at the exact time without us noticing it is quite crazy.
Then the "generated" folder made me think, and i decided to test it a bit more, so i started the experience at 15:00 and 35 seconds, just the right amount to get to the time reveal just after the clock change, and i was blown away, the video shows 15:01 and not 15:00 as i expected, whatever they are doing here to replace the video at the exact time without us noticing it is quite crazy.