alexandertnt, by your standards, all empirical evidence we have is null and void. We can't say that, for instance, an apple thrown by a human standing on Earth will fall down, because it has only been proven a finite amount of time, and we'll never be able to experimentally test all possible positions, apples and throw methods. That's one truly absurd proposition.
The lack of any human victories against any moderately powerful chess AI in the recent decade proves rather handily that the modern good (not intentionally gimped) chess AI cannot be beaten by a human (as in, he cannot force a victory).
Any anti-AI strategy would have to be so complicated that no human would be able to make even one turn a day without help from a computer - and that would rather defeat the whole point. If it was simple enough to be found by a human, it would've been already found - because people tried hard in doing that. Even with utilizing anti-CPU methods, no victories were made, only draws.
Given that the Chess AI is also evolving - and doing it faster than humans, there's practically zero chances that the situation will reverse in the future, unless humans learn to download more brains.