Found at last! Pure Boarding Japan Facebook, June 2015. I just sent a message to find out more about the process used, stay tuned for response.
From the Pure Boarding Japan Facebook site: "Since the sole will melt in the heat of friction, it will paste a stainless steel sole. In Hotwax without, we can improve the slip blowing the silicon spray to the sole. Edge angle. sole is -2 to -6. Side is 86."
I saw a picture once of some skis that had a metal base versus just strips like this board. I'll try looking for it again but searching for 'skis with metal edge/base' or anything similar turns up generic info about ski construction and edges.