Yes, but in another generation it'll all be hearsay, and holocaust deniers will be exactly on the same page as the Discovery Institute: No-one who's around today was there when it happened. So it's all hearsay & agenda-driven speculation. We've got PhD's who've written books that gin up a controversy over the Holocaust. So what if everyone else says we use dishonest arguments? Teach Our Controversy!
There is proof of the holocaust so it's really a silly argument but if it's the best you have, I guess you'll have to stick with it.