It’s not an easy distinction, but actually this person is doing something rather more than lying, he is creating a differant reality.
It’s not just a flat out denial of certain events, its actually a carefully crafted alternative truth.
Irving knows that to do this, one has to create differant layers, like one website quoting another and so on so that the information is so widespread it appears to be reality.
When you hear something from one person, you are more sceptical than if you hear it from lots of folk, and then you reapeat it, and by doing so you change reality, and lending more authority to the story.
Its far more than a lie, referance material is being created, onto this are selectively pinned other ‘facts’ which may come from primary sources or taken out of context witness statements.
Irving, as a historian, knows this, history is built upon interpretation.
Irving knows how his work will be used, but is way too clever to link himself to the end product, he merely states that it is not his fault if other folk take a more extreme view.
Irvings view is not an opinion, because an opinion is informed by facts or lack of them, his view is a construct a careful and deliberate one, he has the facts, which are not in any dispute, these facts are not open to interpretation, these things are known and provable.
I can have an opinion, but when presented with other information, I either modify this or discover new facts to back me up, Irving does not do this, he denies factual events.
He is not interpreting them in the way a political spin doctor might, and he is not being jailed for having an opinion, no, not at all.
He is being jailed for denying facts about criminality, the Austrians and Germans have decided that anyone doing this, in the light of the overwhelming evidence, has other motives for doing so, and this in turn means criminal intent - ie overthrow of the state or support of an illegal political organisation.