But then what is correct is that the birthplace can not be known with any certainty. And this can be shown with evidence.
As opposed to - this fact-claim is unsourced, so remove it.
If an unsourced claim is made, one has to wonder - was it just because someone was too lazy to post the source, or because the claim is incorrect? In the first case, the answer is to find and post the source, in the second, to remove the false or unproved claim.