The thin R2 knives are likely stamped to shape, heat treated then hand Sharpened by Takayuki Shibata san. He is a sharpener that does not forge knives, so his blank is from somewhere else, consider he is a member of TKV, maybe he got it directly from Takefu
There is nothing wrong with it tho, powdered steel like R2 really don’t benefit much from hand forging, in fact with wrong techniques it could be detrimental. Many knife makers like Shibata, Kobayashi or Myojin are sharpeners that don’t forge their own knives, but their job is as important if not more in some cases. Anyway enjoy your Shibata, it is a nice knife.