They ask an assistant for help?
Run it through some panel of experts and demand algorithm changes?
Send it to some Judge API and get back some JSON?
I dunno, what?
They're not exactly very good at preventing or punishing human atrocities, either... it's more of a symbolic group, or a tool of the victors, than anything resembling actual justice. I'd argue textbook authors have more of a lasting ethical impact than the ICC.