If you Google the plate number you'll come across the video posted in a few other places with Chinese description and they all say it was in Dongguan. I did find the "original" version on TheYNC which said it was in Shenzen, but that site is far from a reliable source (I would not suggest visiting it if you haven't been to it before, and certainly don't go on it if you're at work or have other people about).
Many people consider Dongguan as being part of Shenzhen. Perhaps it was at one time.
BTW, I was in Shenzhen in early 1981. Total population was probably 50 people at the very most. A few families in a small fishing village.
I return in 2007. By then, it looked larger than Los Angeles, CA.
Today's population in Los Angles is around 4 million. But ten million in Shenzhen.
Shenzhen is a very interesting place. It is very south, but is very northern in culture, food, everything. This is because it is the city they first experimented with capitalism. They sent many people down from Beijing to build up Shenzhen. They picked that location because it was close to Hong Kong. Capitalism was so successful there, that the city grew in no time and then changed the rest of China.
BTW, the computers we are now using, most likely were built in Shenzhen.
Computer stores there are often ten stories high. One floor will sell only hard drives, another floor, only monitors, another, only keyboards, etc. Far different from anywhere else.
-Don- Auburn, CA