If A, consciously, reports false data to B, and B (or anyone else) has no way to verify, then no one can make the statement, "A lied". So, there exists no such person with respect to whom A lied.

Hypothetically, in a system, if we can inject synthetic data, and make everyone believe in its truth, what happens to the idea of 'lying'? Doesn't it become a sort of Truth if we can effectively manage people to believe in it? It seems to me, no matter how hard, it should be possible to create a web of false beliefs where everyone believes in something synthetic.

Can this be done to machines?