Misrepresentation, again.
A layperson can of course disagree with Dr Green, but they are not in a position to determine with a high degree of certainty that Green is wrong. The same applies to Rudolf and if that lay person agrees with either of them. Lay people, bickering over which one is correct, is just that. The same also applies to experts, as they can also be wrong. So, there is no appeal to authority in my argument.
The most credible and reliable way to determine which one is correct, is to look to the evidence as to what happened. That is the part you hate, because you know it is not in your favour. Mass gassings are well evidenced and when so-called revisionists try to evidence another usage, they fall apart, into disagreement, often contradicting each other and, despite hundreds of thousands of people having been into the buildings, they cannot find one eyewitness they accept.
Then it gets even worse for revisionists, as Rudolf's argument is logically flawed. Just because he cannot work out how mass gassings were possible, whilst leaving little residue, does not therefore mean mass gassings did not happen.
Rudolf has a logically flawed argument, that is contradicted by the evidence of usage. Of course, because of that, he is wrong.