You in fact demonstrated the point, just not the one you meant to, because of the nature of legal cases. There is an opposing counsel that is extremely motivated to find any possible flaw with anything that you say, do, or most importantly file.
Right but (1) this is not a legal case and (2) even if it was it is actually not relevant to the case.
That it can be shown that using a GPT alone, and without expertise, there can be errors in GPT output does not in any show that they cannot be used to search in foreign languages.