It’s true, after reading the white paper and some emails, I see nothing Japanese accept his name.
Discussion
Indeed, it’s also very academic English, so he/she were studied and also probably English native speaker.
There is another intriguing thing and is that, Satoshi was probably a “single genius” behind it all, as it is pointed in the article. Patterns, consistency in the writing style and code analysis lay that out
If it was a group, the secret would likely be out by now, and his stash tampered with..
Well, a lot of people believe that they were two people involve.
One was a communicator and the other person was the coder.
That was kinda “busted” with the email list. Satoshi (communicator) described the code base like if it was the coder.