I would be shocked if it was more than .010", if any at all. I didn't come across what the thicknesses were but the way it's described seems pretty thin. It sounds as though the resulting surface is quite hard and wear-resistant, but when it does wear to the point that a bore would be necessary, it's probably time for a replacement block or maybe by that time the process will be available in the aftermarket.
To be transparent, what I understand of this process is only because I googled it after I read the original article and read a little more.