None of that has anything to do with whether the translation is correct.
What you can't verify is the rest. Whether a screw came back as a bolt — both real terms, both plausible, one of them wrong, and no way to tell which without knowing the language and the product. Whether a qualifying condition survived into the target sentence. Whether a should became a must. Whether a claim you're permitted to make in one market got stronger in another.
And when the visible layer does fail (broken tables, hanging elements on a file that was supposedly reviewed) that is a finding about the invisible layer too.