See, what they SHOULD have done with those cars was test the door impact to see how much improved, if at all, the doors are from withstanding blunt force in order to break the lock mechanism. Canadian 3 drivers are practically begging for it.
The ship wasn't even fully submerged in the water, so there had to be a decent amount of cars on the side of the ship that was facing upward that I'm sure were fine. But I guess like they said they couldn't run the risk. Also the article did say that they don't know what might have happened to cars that sit at that angle for 3 weeks and where the fluids inside might have flowed.
Sucks to hear about this happening! I do agree with what the guy from Mazda said in the end of the video about how Mazda could not risk the reputation they have built thus far by any of these cars getting out into the retail market and jeopardizing their image over something like this.