Interesting one of the first 'tales' I read about was some person in (I think) Sweden who took his drives home in his car with heated seats. And when they needed to use them they wouldn't work. The point was 'you have to test backups'. Now that I am thinking of it possible this was even with tapes not hard drives.

By the way with that video I am also thinking maybe it wasn't the magnet that scrambled the drive but some other force that was applied as a result of the effect of the magnet on chips or the laptop. [1]

[1] I don't think that was what happened but the test does not isolate the drive from any other possible impact is my point.