I've listened to some of them. They believe that the event was exaggerated. They think it was work camps with mistreatment, disease, death and maybe even cremation. They just don't think it was as much of an extermination program as was described. There is no solid consensus though. Evidence is good for such things.

They think the Jews used assets within the allied forces to misrepresent and inflate the event in order to achieve a significant, useful public trauma. The trauma is seen as useful for attacking those critical of Jews and thus furthering their own self-interests as a group.

They also believe that the Jews who engineer this type of thing are not believers in the Jewish faith as much as users of the Jewish people's image for self-serving purposes. They use them as tools to achieve influence in the world without getting into too much trouble for doing so. They use them as a shield against legitimate concerns in order to facilitate their domination agenda.

There's probably a lot more to be said, but who wants to spend much time listening to them?