Riding in a paceline doesn't mean one is racing or riding erratically.
Yep, that sure does clarify that incident. The truckie was either incompetent or did that on purpose, I'd suggest the latter. The video is highly artifacted, I couldn't make out the number plate.
Did you check your rear before making the overtake? In as much as the truck had 2 lanes it is a brave cyclist who gets in front of a truck like that. Frankly I would have simply waited till the truck had passed and used it's slipstream to power down the road.
From what I see the truck driver had plenty of time to see what was going on ahead of him regarding you and your group.
Hard to make a judgement as to who's in the wrong here but I did notice that you didn't glance to your rear before moving out of the bike lane to overtake the guy in front of you. As noted by another poster if there had been traffic in the right hand lane the truck would have probably collected you.
Anyway glad youre alive to tell the tale.