Yes I have seen a similar graphic before. I think it is absurd and does not work. Just to point out one problem with that graphic, if that were true then when the sun was at sunrise or sunset it wouldn't look like the sun was going down or up as it does, it would look like the sun is going sideways because of the curvature of the flat earth and the curve of the sun's movement. Also if the sun never really went down below the earth you would be able to see it always because there is nothing blocking the rays of the sun. If there is nothing between the sun and us, as on the flat earth model, then the rays should always reach us.
Maybe I am mistaken but I cannot get it to work in my mind.