Well then, you should also know that these indictments were filed under oath by Mueller and his team, under the penalty of disbarment and literal criminal charges
They didn't lie, they don't have to. Everything in this indictment may be what they believe happened. But these are broad strokes. It looks like any of these allegations would be difficult or impossible to prove beyond a reasonable doubt. Grand juries indict based on probable cause, which an entirely different (and far lower) standard. They have probable cause if a credible witness, such as an FBI agent, simply tells them that they believe something happened.