Yes because the van driver already suddenly braked in front of him and then uses his van to try cut him off. The van driver is clearly unstable and shouldn't be driving with those anger issues.
Do you think the cyclist should be out on the road with his obvious anger issues? Shouting abuse at the top of your voice at passing motorists, recording it, and subsequently broadcasting it, aren't the actions of someone who's mentally stable. It might even constitute assault - it certainly triggered a situation that the cyclist then.. erm... tried to backpedal from at a rate of knots