I must say that i got myself a good laugh, because the counterargument against flatearth is round or sphere...which is also wrong.
...
That is the Potsdam "gravity potato" and it is a synthetic image meant to represent the shape of the Earth in proportion to gravity felt at any point on its surface.
The actual shape of the Earth is still ellipsoid/spheroid (bulging at the equator - ie, ellipsoid - due to spin).