The Wannsee Conference, which was the kickoff of the Extermination Phase, was in January of 1942.
In January 1939, Hitler had addressed the Reichstag and spoke clearly about his determination to exterminate the Jewish race.
The corpses of the 33,771 Jews murdered in Babi Yar in September 1941, two months before the Mufti and Hitler met, would seem to be facts to refute Netanyahu's claims. This is why I am questioning them.