2 Text added for clarification.
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Being a Holocaust denier involves denying that the Nazis carried out any large-scale systematic destruction of the Jews. If someone maintains that the Nazis killed 5 million rather than 6 million, whoever put forward the 5 million figure is hardly denying that the Nazis carried out any large-scale systematic destruction of the Jews.

It's a non-sequitur at the very least. Crudely, the Holocaust was a deliberate mass killing. You are not denying that it was a deliberate mass killing if you reduce the numbers from 6 million to 5 million.

If we regard the Holocaust as involving more than 'mere' numbers and see it (for what it was) as a deliberate attempt to remove the whole Jewish population, it can still have been precisely such a deiberate attempt even if the Nazis actually managed to kill 5 million and not 6 million.

Being a Holocaust denier involves denying that the Nazis carried out any large-scale systematic destruction of the Jews. If someone maintains that the Nazis killed 5 million rather than 6 million, whoever put forward the 5 million figure is hardly denying that the Nazis carried out any large-scale systematic destruction of the Jews.

It's a non-sequitur at the very least.

Being a Holocaust denier involves denying that the Nazis carried out any large-scale systematic destruction of the Jews. If someone maintains that the Nazis killed 5 million rather than 6 million, whoever put forward the 5 million figure is hardly denying that the Nazis carried out any large-scale systematic destruction of the Jews.

It's a non-sequitur at the very least. Crudely, the Holocaust was a deliberate mass killing. You are not denying that it was a deliberate mass killing if you reduce the numbers from 6 million to 5 million.

If we regard the Holocaust as involving more than 'mere' numbers and see it (for what it was) as a deliberate attempt to remove the whole Jewish population, it can still have been precisely such a deiberate attempt even if the Nazis actually managed to kill 5 million and not 6 million.

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Being a Holocaust denier involves denying that the Nazis carried out any large-scale systematic destruction of the Jews. If someone maintains that the Nazis killed 5 million rather than 6 million, whoever put forward the 5 million figure is hardly denying that the Nazis carried out any large-scale systematic destruction of the Jews.

It's a non-sequitur at the very least.