If he and his supporters genuinely believe that, it's an extremely democratic position.

Remind me what its called when someone's geniune belief's don't align with reality?

You are going with the assumption that the election wasn't stolen. If you are correct then Trumo would be taking an anti-democratic position. If the people's will was genuinely to elect him and the election was actually stolen then he would be taking the democratic position.

Not quite. If he actually believes that the election was stolen, whether or not it was, it would be a democratic position. He would be right or wrong, but that doesn't change that his goal would be to protect democracy.

If he actually believes the election was not stolen, whether or not it was, but act as if it was stolen, it would be un-democratic position, because he would, is his perceived reality, try to subvert a democratic process.

People can adapt their beliefs to be convenient to them. In fact, people's beliefs usually correspond to whatever is most convenient. If he should have known that the election was not stolen, then claiming otherwise would be undemocratic, regardless of his true beliefs (which are unknowable anyways).