No - it's because you haven't grasped the fact no piece of wood is the same as the next. So whilst there are subtle differences in the tones that demonstrated in that video, if you built those same basses again, using the same type of woods, they could still sound different again to the ones in the video - because wood, even of the same species, aren't identical.
So in short, this video doesn't teach us anything - the sample size would have to be much larger to be able to start drawing any observations of scientific significance.
Besides, even the electronics aren't consistent - there are tolerances in the electronic components - and the pickups are likely to be scatter wound... which obviously means they aren't going to be same, even if manufactured to the same spec.