This is way above my paygrade, but trivial zeros of the zeta function are at the negative even integers (ie they are of the form s = -2n for some natural number n) because that's what Riemann said in his paper where he made the conjecture[1]
This equation now gives the value of the function ζ(s) for all complex numbers s and shows that this function is one-valued and finite for all finite values of s with the exception of 1, and also that it is zero if s is equal to a negative even integer.
I don't think people get to retcon some other kind of zero into being trivial.
Ok, but if zeros there are found some mathematicians may as well call them “trivial zeros.” Can there be an objection to that?