TBH, then, having watched the whole video, colour me as a know-nothing.
Most of those passes were non-events or (such as the one starting at around 0:45 or the one starting at 3:48) he was chasing the car across the road to make it look worse.
The rider also didn't help himself on some occasions - such as passing the blockage at 2:25. Any of those cars could have taken to the grass, just as the rider did.
The shame is that there was some genuinely inexcusable driving (the SUV at around 2 minutes) which was completely diluted by, well I was watching the glorious countryside rather than considering most of it to be close passes (such as the one starting at about 3:08).