Reading through the comments, they timed from when the cars actually started moving.
In my experience, the 1-foot rollout alll the major US mags apply, as well as the SAE corrections guys like Motortrend and Car&Driver use, skew the times quite a bit.
Add to that the lack of any obvious burn-outs to warm up the tires, and you've got your difference right there. Or some of it. The rest could be in car prep, the state of charge of the system, and the effects of ambient conditions on the electrics... etcetera... possibly still damp track (being blow-dried in the video)...
All you can say is that the times they got in those conditions are probably the times they flashed (though they never showed the actual runs)... and are only useful in comparison to each other.