I would like to point out that many Nazis nowadays also hide their nazism behind less drastic speeches and policies so that they are not touchable by any bans and can avoid prosecution since nazi parties aren't really allowed here(and possibly not in Austria either).

That he called concentration camps punishment camps can be one of two things IMO:

1. He made an honest mistake, used a wrong word to avoid a pause

2. He incidentally said what he really thinks and later corrected it to a more PC version to avoid further problems

The problem I have with calling them punishment camps is that punishment to me means that you did something wrong before you get punished, being born hardly qualifies for me. Basically all of the criteria that made someone "deserve" punishment according to the nazi party were and are only shared by nazis which disqualifies these camps from being called punishment camps in my opinion because they weren't about punishment by any sane standard.