Failing to achieve a result does not prove that the result is impossible; it establishes only that the person attempting it did not achieve it.

“But, uh, it, it's is not definitive proof because it could simply be that I made a mistake, right? Uh, the fact that I don't achieve a certain result doesn't mean that a re- result cannot be achieved.”

“It means that I couldn't achieve it. But, uh, so it's very difficult to have, uh, a proof against it, right? So it's more, uh, evidence for it if you succeed.”