This honestly seems like an entirely normal, acceptable, and possibly legal thing to do. It is safer for cyclists making turns to get out ahead of traffic, so that turning traffic hasn't accelerated by the time the encounter the cyclist. And moving to the front of traffic between lanes is the same maneuver as motorcycle filtering, which is allowed in many areas as it improves both safety and traffic flow.

Imo, fault lies on the operator of the multi-ton vehicle who went through special training to learn how to safely operate said vehicle, the government for any lack of appropriate training, the vehicle manufacturer for creating such blind spots on their vehicle, and again, the government for not recognizing these blind spots and making modifications to the vehicle to account for them.