Well, this isn't the best analogy but it will do...
The other day one of my friends said that he didn't think I could run faster than a 5 minute mile. He even said that if I do run faster than a 5 minute than I am a god. So we wrote it down, if I run a 4:59 minute mile then I am a god. And behold I ran a 4:53 mile.
By your reasoning it is now a fact that I am a God.