I know how just about every fastener is made. I also know how to look for toolmarks on the work product and I guarantee you that the bolt in TFA was made by machining rather than by stamping. Because this is a marketing instrument, not just a fastener.
I'd be unsurprised if they photographed a the pre-production one that was milled. They will almost certainly not be making the bulk of them that way. It just doesn't make sense in any way. At minimum order qualities in the tens of thousands (which they will certainly exceed) it makes sense to sub out to specialists.