My PN began after several years of chronic pain. I'm not quick/ready to conclude cause & effect, nor dismiss it; I will start looking into it further. Coincidentally, some of the supplements recommended in the article (vitamin E, R-Lipoic Acid, grape seed extract, N-Acetyl-Cysteine (NAC)) are familiar to folks in this forum. I had already been taking NAC, and when I learned of RLA's potential benefits, I started that too, and all of the burning and most of the prickling/shocks ceased within days.
http://neurotalk.psychcentral.com/thread130991.html
I experienced further improvement after adding pantothenic acid (B5) to the regimen.

I learned about cortisol's (and other adrenal hormones') connection to chronic pain from several articles by Dr. Forest Tennant. As recommended in one of those articles, I had my cortisol levels checked (along with testosterone & pregnenolone). "Adrenal Fatigue" is not recognized by most of the medical community, but "adrenal insufficiency" is, so that was the approach I took with my doctor, as my tests were extremely low in all three. I began supplementing them by taking pregnenolone with B5 (which I was already taking with the RLA) which is converted to all the other adrenal hormones internally.
http://neurotalk.psychcentral.com/thread156416.html

Since you're on-board with the article you originally posted, you might look into trying RLA & B5 for your PN pain.

Doc