PS: and of course there is nothing inconvenient about Grabner's flat-out denial of the Auschwitz soap, except maybe for you, since it undercuts your use of a newspaper article to claim that Grabner had made an actual grand-scale Auschwitz soap claim.
Notably, Grabner's later statement isn't even about soap, but rather about fine oil, and is presented as pure hearsay (something he allegedly learned from a scribe). That's the only thing he could furnish when asked about the soap at all - some related-sounding but still different thing. And the existence even of this process in the camp was unknown to him, as he states directly. Geschweige denn ein Leichenseifenherstellungsverfahren.