They cannot tell us anything about the invisible world because they cannot establish any kind of contact with it. They cannot even reject it because it has not been known. Visibility and invisibility are relative terms. If there had been a wall between me and the tree, my eyes would have failed to see through it. Even without the obstruction of a wall, I would not be able to see the tree from a distance.
Distance obliterates vision with the result that the otherwise visible world becomes invisible.
What we can see with the help of the microscope, we cannot see with bare eyes. We can see only the gross material world. The eyes are also gross. Reality is subtle. So it can be grasped with only the intuitional vision that is developed after the karma particles eclipsing consciousness have been removed.