This example implies only statistically significant results get published. But 'proving' a null may also have value depending on how non-trivial it is to the no

This example implies only statistically significant results get published. But 'proving' a null may also have value depending on how non-trivial it is to the non-scientists in that society. And if you extend the hypothetical such that everyone in that society always had true nulls, there wouldn't even be a need for science. We'd all be too used to never being wrong.