That's their interpretation. The actual crimes charged can be found on the record.
The crimes charged before the Nuremberg courts were crimes against peace, war crimes, crimes against humanity, and conspiracy to commit any of the foregoing crimes. In all, 199 defendants were tried at Nuremberg, 161 were convicted and 37 were sentenced to death, including 12 of those tried by the IMT
Nobody was indicted or charged with genocide for killing 6 million Jews.
Just like nobody was charged with insurrection for January 6th.
If one is proof of the crime not occurring, it means proof neither crime occurred. And we know that's wrong. Which is why claiming nobody was charged fails the burden of proof.