The prerecording theory is that the reason the windmill appears on the screen in Tool's Room but isn't actually there on the Newmaker Plane is because the recording is from long ago and not actually a live feed. See graph for order of events
There are holes in this theory, however: If the recording played in episode 6 actually happened prior to the series, why doesn't Paul find Toneth before? Although its possible he just doesn't even try going south of the camera.
As of episode 10 of Petscop, another hole is presented towards this theory when Paul manages to become a shadowy figure and find a visible windmill.