No the passing on the left thing isn't related to bike lanes. The law simply says you can neither "ride past" nor "overtake" a vehicle on the left that is indicating and turning left. The "ride past" bit is key. It doesn't matter if you're in a bike lane, you can't "ride past".
No, definitely not the case. If you are in a bike lane you are in a separate lane, period.
Anyone seeking to merge or cross must give way just like you were any other vehicle in any other lane. The no overtaking on the left when a vehicle is indicating left applies when overtaking in the same lane and only to bicycles since they are specifically noted in the rules as the only vehicles allowed to overtake on the left. However, if you are not in the same lane you are not classed as overtaking on the left..
The consequence if inthewoods assertion is true is that every vehicle in the lane to the left of the indicating vehicle is obligated to yield. This is not correct. The vehicle changing lanes is obligated to give way to any vehicle already in the lane.
What that green truck did is worth following up with the cops as it would result in a TIN in any of the states Qld included.