I think you may have misunderstood how the experiment works.
I see perfectly well how the experiment works. The experimenter is aligning the water to be level, but the camera is down below the water line. The camera needs to be centered with the water line.
There are no mechanisms in place to ensure that the camera is exactly centered vertically with the water line. Its just a guy holding a camera in one hand and glasses of water in the other. Bad experiment.
Now how about addressing my points? Pointing me at different experiments really sounds like you guys are saying "well, you win on this one.... but look at this other thing I found"
Perhaps we're taking a page out of your book?
And no, the camera cannot be "below the water line" if the the water lines are aligned. That isn't how perspective works. I suppose you could cast doubt on whether or not the water lines are level -- but that's why it's been recommended you do the experiment yourself!