Why has a metric ton of Holocaust denial articles recently resided on Ron Unz's website?

And by that I mean stuff like this - and there are 17 pages more like that. The links to the index are still live, the links to individual articles no longer work but many are accessible through the Google cache (archived example), and all of them are actually posted from Ron Unz's account.

Is this some kind of a sabotage or hacking attempt? Doesn't seem so, because Unz's other website still has the whole collection of the IHR articles here (archived version).