It’s kind of a disingenuous comparison in the video, but I understand why he did it. The one that settles slowly has no dampening, either fluid or an inductive plate, because he set its initial position by hand. Can’t really do that if it’s in a fluid, although he could have compared in other ways, like setting the initial position with another magnet or comparing to another induction dampened compass and emphasizing that you can see through his.