Your stated opinion is that David Irving is quite an insider as far as Hitler's Germany is concerned. You seem to believe that he is a military historian whose opinion should be considered despite the fact that you claim: 1. that the relevant documents aren't available - and therefore seemingly his knowledge has no factual basis, and 2. Only Jews are permitted to study the Holocaust, so he presumably would have no access to whatever documents do exist. So that your premise collapses.
15 police officers killed in Colombia helicopter crash (Reuters)
from the article: Oxford Union reportedly invited Holocaust denier Irving to speak