Yes and no. You describe it as a scientific theory which it is not.

To really understand flat earth, you have to understand the "copernican desillution" (there is a similar term for that but I can't find it). If the earth goes around the sun instead of the other way around, we are just an insignificant planet moving around just an insignificant star.

Flat earth puts the earth back to the center, where is always belonged, and goes all in on that by making it flat again