It would be interesting to figure out the sources of error here. I am assuming Pusher is able to get sub-100ms in pushing the data? I'm guessing the rest of the error is due to a combination of:
a) GPS positional error (GDOP, deflections of signals in the atmosphere etc.). Which is why the car appears on the pavement and 10m forward.
b) GPS time delays. Which is why the "virtual" car appears to be moving slower.
I'm going to go a limb here and assume it's a proof of concept. The article is pretty thorough at explaining the process, which can be refined if the user decides to go further.