Yes, that is what I have read as well.
“However, from what I heard, the gas chambers that exist in museums today are either reconstructions or cannot function on the scale of millions, so there is room, logically, to argue what he does.”
“Yes, that is what I have read as well.”
Then perhaps you would want to revise your comment about how logically, there is room for him to argue what he does, when the proof is overwhelmingly otherwise, and does not allow for his brand of “logic”, which is actually anti-semitism in disguise, well actually, not in disguise at all.