The choice of camera angles seems biased. Most of the shots showed the driver's side of the old car where the impact is and only the passenger side of the new car.
I'm not disputing their overall conclusion, but it'd be fairer to start with overhead angles and show equal time on both sides.
They show the same camera angles for both, and an overhead shot of the impact. Both cars impact on the same (driver's) side. The most important two shots in this are the interior shots, and the left-hand door. On the Bel Air, you can see the passenger compartment get crushed -- the steering wheel crushes the occupant against the seat, the door is more-or-less ripped off, and the roof crumples inwards.
On the modern car, it does what it's designed to do -- the steering wheel stays put, and the passenger compartment forms a solid cage around the occupants.
I'm not disputing their overall conclusion, but it'd be fairer to start with overhead angles and show equal time on both sides.