I’ve got a hard time agreeing that the deniers should have religious sanctions against them.
What about those who think that 9/11 was staged?
What about those who think the world is flat.
What about those who think the sun revolves around the earth?
And those who don’t believe in the Armenian genocide?
Should they be excommunicated?
But the Rabbinate also has the right to break off relations with those whose decisions empower and encourage Israel's enemies.
Shalom.