Is it possible the powers that be are hiding the fact of large areas of land that we the people are not even allowed to know about? Sounds like something they would do if they could get away with it. I do not know for sure but it sure looks interesting.
The powers-that-be are incompetent idiots that serve special interest and are at the mercy of their own lascivious appetites.
They are incapable of hiding their their own corruption much less the corruption of a worldwide organization. In America, entire presidential administrations have fallen because they couldn't keep a secret. There is no way the Donald could keep his mouth shut about UFOs, a flat Earth, or a large Earth.
Even with unlimited resources and no oversight, America's most top-secret agency failed to keep their most top secret program a secret. There is no way they're hiding Bigfoot or the shape of the Earth or anything else that would shake humanity.