This is not correct. At the start of Nazi rule, they promoted emigration and considered sending them to Africa.No, the Nazi's did not want the Jewish people to flee to areas outside of their control. They wanted the total destruction of the Jewish people.
The mass killings only started towards the end of the war.
They also may have dreamed about total destruction of the Jewish people, but that was never possible. They never had access to all Jewish people. Even if they had killed all Jews in Europe, the Jewish people in America and west Asia, including Palestine, would have remained. That's why the genocide convention specifies that genocide occurs even if it's only an attempt to destroy a group in part