I'm not sure you're right Orbytal. The Australian TV documentary's excerpt of the Armstrong affidavit showed the lawyer introducting his questions by checking LPh understood that though they were in a conference room it was the same as giving evidence in a court. I presume, therefore, that an oath was administered.
Given that he was lying to get his mitts on a large amount of dosh, I'd expect a judge to take a dim view. But, of course, if he pays up before it gets to court the question would remain moot.