Saying it's false is a valid argument against something completely ludicrous like 680,000 dead. If you expect everyone to come up with "valid arguments" for blindingly obvious things then it is you who is not carrying out polite conversation (as per your other comments)
It would be a valid argument if you provide evidence for it, such as other commenters here have done. Whereas you just rejected my claim without any argumentation.
I have provided a source for the numbers cited in the original comment. Where those numbers are explained.
Also "These numbers are just false" is not a valid argument.