When reading up on the atmolayer lip hypothesis I noticed references to the "infinite earth", the idea that our world is an infinite plane. How is this notion even remotely compatible with zeteticism?

Infinite earth is conceptually analogous to the nonsensical idea that Earth rests on "turtles all the way" and is thus axiomatically impossible to inquire about. No FE experiment conceived on zetetic grounds can show an infinite plane to be either true or false - one could always argue that that you didn't venture far enough to see the edge.

Is the hypothesis about the Earth as an infinite plane really viable from a zetetic point of view or do I miss something? A  discworld makes more sense in the FE context, me thinks...