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there is overwhelming proof otherwise.
This is a case where huge geo-political actors had a motive to create what would be the biggest con in history - The Allies needed an excuse for destroying Germany. The UK Ministry for War Propaganda, The US Gov, Soviet Gov, Jewish International lobby. All of these were fabricated if they wanted to.
There have been many fraudulent Holocaust survivor claims - before Herman Rosenblat admitted it was 'real in his head', was his testimony proof of the realness of his Holocaust story? How is this different than the other testimonies. Extraordinary claims require extraordinary evidence.
Sources before 1939 claimed that about 6 million jews lived in europe while it was reported that in 1945 the jewish population was of 5 million.
You mention sources but you did not provide them?