Well, isn't that interesting!
The video is in Russian, so that explains why it is usually the Russians that are winning the Contest of Mayors with impossible scores.
So my best guess is that it still works because the Russians still keep hacking the game.
I still can't believe they haven't been able to make this game with check points in it that immediately red flag someone when an unusual points score comes up. They should know what the average score should be and how many points you could earn in a day. Anything that goes against the clock should immediately be frozen and investigated. How complicated is it? If Facebook can do it, I am sure they can too.