Orwell wrote the book in 1948, but since it was supposed to presage a future society, for the title he simply inverted the order of the date's numbers and he called it 1984. In his book Orwell dealt with the bastardization of language and doublespeak. Black is white. Peace is war. Truth is false.
Falsehood is truth.
With Holocaust denial, the world foreseen in 1984 has arrived. Holocaust deniers are out to mesmerize, to confuse and to dislocate. They are out to make people unsure about definitions, to unhinge them from their certainties, to make them lose sight of right and wrong. In this way they aim to achieve their ultimate purpose, which is the unabashed and unqualified rehabilitation of the Third Reich. If there was never any crime of mass murder then there are no mass murderers.