His views on other topics do not necessarly validate or invalidate his views on Bitcoin, but these views can not be ignored and as I said in my comment, they should be taken into account while forming your own opinion about his article.
I still don't understand why they should.
If someone's clearly a lunatic in certain areas, I'm going to have a little less faith in their rationality in others.
It serves as evidence that he is an uneducated idiot who lacks common sense.
Then inability to reason in one area is a good indicator that a person simply doesn't reason well at all and casts suspicion on everything he says.
Inevitably you have to trust some expert opinion because there isn't enough hours in a day to research everything yourself. I don't know about you, but someone who holds the insane views that this nutbar does, would certainly make me question his competency to give sound economic advice.
The pattern of the mans publicly disclosed ideas really paint a picture of who he is...in this case a right wing reactionary ideologue.