Have you asked whether your father has even
heard of bitcoin? I suspect a fair chance that he has. This is not adding the fact it would only take for someone in Dorian's family to merely google his name to learn of bitcoin.
The problem is Dorian is feigning total ignorance to the point of absurdity, followed by silly claims that somehow the accusation has damaged his family and his job prospects. He even went as far as claiming he has no internet service at all since last year, which is odd since clearly he must have emailed Leah Goodman only a month ago (another major plausibility problem in his denial).
It's one thing to be a grumpy old man, wanting nothing to do with the media, and quite another to blatantly lie and mislead people when trying to deny something. His behavior is closer to Lance Armstrong than just a grumpy old man. I think people need to weigh the credibility of both Dorian and the Newsweek article, and not merely dive head first into trying to disprove Newsweek at all cost.