That programming part will be done by thief at his workshop before breaks in and steal the car. In short...
1. He has to re-program his own transponder ECU of the same model and program a matching key at his workshop.
2. After breaking into the car with a master (mechanical) key he just has to unplug all ECU connectors of the subject car and plug those into the pre-programmed ECU he brings with him.
3. Then he has to bypass the mechanical key section of ignition and start with the matching key.
Come on... the video is not that hard to understand.
For those a bit more technical, the code verification between main ECU (inside engine) and transponder ECU (under dash board) is unfortunately standard for the same model.