As an engineer who has worked with transit authorities for decades I can say the concept of this being an intentional test of some sort is utterly preposterous.

Since the video shows the opposite platform being vacant, at least within the camera's view, and nobody rushing up to consider the situation, we must assume that a nut case or a scuffle on the opposite platform resulted in the bike being on the track and that the responsible person(s) had fled. My point was that for the videographer to wait patiently to capture the train running over the bike on camera instead of rushing to an emergency phone present on most transit platforms to alert the system of the hazard is the height of irresponsibility and possibly a crime in itself. Even if it turned out that he didn't have time to stop the train, most people would be rushing around in panic trying to do something, not waiting patiently for the train to arrive, camera in hand.

Additionally, the likelihood that the videographer might have placed the bike on the opposite track is extremely low. He would have had to climb down from his platform and over the third rail and placed the bike in position, then climbed back over the tracks and up to the platform, presumably knowing that he was safe from arriving trains. Extremely unlikely. If he tried to fling the bike from his platform the likelihood that he could get it through the row of steel posts between tracks is also extremely low.