Are you correcting the quote or are you implying that in the quoted passage Stevens misrepresents Shirata?
Neither. I’m mostly pointing out that it’s not a given (in the sense that it’s not all that clear) to me that it is Shirata’s view that is represented here. For instance, Stevens added a short biography of the Founder to the book which surely contains information that came via Shirata but is as much the product of Stevens’ own research (IOW via other sources then Shirata). In other parts of the book Stevens sometimes mentions quite clearly when passages are either a summary of or references to Shirata’s point of view. Regarding hanmi I don’t find such a reference so it’s left open to debate.
Anyway, I second what Chris said, it has little to do with the main question.