[hypermatt]

The linux box was in his lab most likely in a private network, which he dialed into. He didn't dial into an isp.

[tmountain]

Good point, but one could also take note of the number he dialed on the telephone in the video.

[InclinedPlane]

Indeed. It's pretty likely that voice number still has a 300 baud modem hooked up to it. Or... not.