The buttons probably send "do it now" type signals to code burned into the chips- they aren't on/off, they are the knocking over the first domino. Never mind that without the proper version of "hi, my name is" at the front of the message, the satelllite will think it is just noise- a packet with the wrong structure isn't a packet, computers are stupid. Too stupid to be fooled by something like this.

And more importantly, why would you want to do this?