Sure, but seeing what is happening on any individual balcony would be difficult, especially at night.
While they might pick up someone physically throwing an adult overboard (an extremely difficult manuver), would they see someone standing on a chair get pushed?
I saw the video from last year’s incident. It showed the woman climbing unto the railing, attempting to cross to next door, and falling. But you’re right, the angle doesn’t show much inside the balcony if at all. I guess if there was a struggle, it would somehow show depending on zoom ability.