If the Jews of Europe were not exterminated by the Nazis, what happened?

Deniers claim:

After the war Jews of Europe were still in Europe, except for perhaps 300,000 of them who had died of all causes during the war, and those who had emigrated to Israel, the United States, Argentina, Canada, etc. Most Jews who left Europe did so after, not during, the war. They are all accounted for.

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This is ridiculous. It would imply that about 5 million missing Jews have emigrated to these countries after WW2. This is not supported by reality, not by a long shot. Most Jews in these countries came before WW2. In Palestine, for instance, there were 370,000 Jews in 1936, and 590,000 in 1947. There were 5.54 million Jews in America at 1939, and about 6 million today. There are about 6 million missing European Jews, and they are not accounted for -- except by the German camps.

Interestingly, the famous "revisionist" David Irving has recently made a surprising admission in a radio interview. Totally out of the blue, he stated that he now believes that as many as four million Jews died in concentration camps during the war