Hello. You did not enter the text to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
As seen in the question, Watanabe's account tells a story first hand, that is, Watanabe participates in that story, so his account generates truth and leaves the story more suitable to the public, who can hear what really happened. The importance of this report being translated into English is that, in this way, the report is able to reach the entire world, attracting a much larger audience.