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Is it even possible for someone to be a globe earther if they can clearly see the flat earth horizon?

Yes but the problem is that geocentrism is undermined by the lack of curvature.

What is wrong with  your eyesight; I see a curve.

If we are to take this by personal experience, then mine contradict what is seen in this man's video. When I was little we would sometimes go to Galveston and stay at a house my uncle would rent. I don't know the exact height, but adding tge sea-wall and a two to three story building means I would have been about the equivalent of five stories up. Anyway, from the top storey window you could see ships and even riggs out in the Gulf, but when you got down to the sand you couldn't see them anymore. It seems my experience conflicts with this video. Of course, being a decade ago you could just claim I maybe don't remember well. But that is that, make of it what you will.
   With the above in mind, a sphere does not have to be perfectly round. If you smoosh it just a bit, that slight oval effect could affect the seeming lack of curvature some people believe they see, like in that video. That is just something that seems possible in my mind.