The post you are reporting:
As I understood it from PaulB's post, he didn't deny the genocide that Hitler had carried out, for which, as Peter correctly points out, there is a law in Austria and in Germany promissing criminal charges.
He seems to have glorified the genocide, and this is totally unacceptable, offensive; it wouldn't surprise me if there are laws in a number of countries that consider this too a criminal offence!
Personally I don't use the word holocaust in reference to the genocide that took place during the Second World War, as it has a biblical meaning and refers to sacrifice of certain animals in honour of God in the days of the Old Testament. It cannot refer to people!
Furthermore, the genocide, as pointed out by other posters, also hit many other people, includiing Gypsies, and also Soviet prisoners of war.
I think that this individual has commited a serious breach of law with his statements, and if he is in a foreign country, he might well be expelled and asked not to return.