There's plenty of clear differences in the set-up of the stunt that must surely create different outcomes... one example aside from the clear lighting, size, quality and consistency of the image between the two walls in the experiments is this...
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Parallax effect going on with the image of the lamp post and the top of the real one must surely be a giveaway for the system as it must be looking for things moving with differing speeds across it's field of view.
That's just one example, I'm sure people familiar with the system can throw it either way.
I don't think it changes either of the points being made though. The fact the guy failed to 'fool' the car in the second experiment doesn't mean it can't be done, it just means he couldn't do it, where the first guy could. Who knows, with the new software perhaps it would be even harder to 'fool' the system. But the other point still stands, even when the experiments aren't intentionally designed to 'fool' the system, and just give some difficult - but more likely real world scenarios, the system is still deficient compared to a system that uses an entire other 'sense' alongside it's vision.