Yes. He demonstrates that light bends downwards. contrary to FET. FET claims that bendy light makes the sun appear to go below the horizon when it's still above it, and Stephen Fry is trying to demonstrate that the sun appears above the horizon when it's actually below it. Since the Sun can't actually be below the horizon in Flat Earth, and Stephen Fry says it is, it shows that he is not trying to demonstrate any kind of Flat Earth theory.
I understand your confusion. Fry is clearly trying to introduce the concept in baby steps. He is trying to get the viewer to question their universe. I'm sorry that you failed to grasp the subtext, but that does not discount the fact that Fry is clearly trying to introduce the concept of a flat earth into the media.
no he is not, he says
"light passes through out atmostphere at a shallow angle, and is gradually bent as air density increases"
and it is not making us question the universe, he is teaching these people about refraction, which is a rather old idea ( i think newton was on it )
and it functions in glass, water, ect.
he even says himself that the earth has already turned enough (something along those lines)
but, in fe, the sun doesnt hit the night area at a shallow angle, and bendy light does not bend in the way in which stephen is demonstrating
and hence, stephen fry is clearly trying to demonstrate the known scientific priciple of refraction