But, that is precisely the point why blind testing is so hotly debated. That just goes to show how easy it is to make a false conclusion in a sighted test when only hearing should be the determining factor.
It does show that eyes can be a problem, if you forget to change modes when listening.
Normally the brain defaults to trusting vision over all other senses, but if you don't register what you see, the problem goes away.
As soon as you are aware of this, you can eliminate your "visual" bias, if we can call it that.
Everyone can do this by simply closing their eyes.
Edit: on the other hand, those tests show visuals that make sense in a certain way, a ball jumping up a stair way, or mouth movements that fit a certain sound.
But does a speaker or amp appear to have a certain sound, which could confuse you? or is it just an inanimate object?
I mean, If the looks of my speakers overruled what I was hearing, I'd think they sounded like utter junk, because that is what they look like.
But they don't sound like junk, and their sound doesn't change because I close my eyes.
Not seeing (by closing my eyes or not noticing what I see) does allow me to listen more carefully though.