These are not proof that Satoshi was in fact a US-based native speaker of English, but they are evidence.
Let's hit this problem with Occam's Razor: Which is more probable, that a native English speaker would choose a Japanese pseudonym, or that a native Japanese speaker would choose a Japanese pseudonym, and then proceed to go to great lengths to pretend to be a native English speaker using a Japanese pseudonym?
A Japanese person would be more likely to use a Japanese pseudonym and then modify his lifestyle to correctly tailor to his intended English audience. It is pretty easy to say this, because "more likely" is subject to an individuals interpretation. Like I said, your evidence is not evidence at all, as it can be twisted to support either side. It is situational evidence at best.
You're also trying to twist Occam's Razor into a false dichotomy.
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You seem to be unaware of two vital concepts in human beings: lying, and detection of lies, otherwise known as "doubt". I "doubt" Satoshi is Japanese. I "doubt" he is Japanese so much, that it is beyond reason. Though I can never prove he is not Japanese, I have enough "doubt" to know that he isn't being honest with his identity. Anyone should be able to clearly see that I am not President Obama; it's okay to have doubt. You can doubt my identity. Simply because you cannot prove it to the absolute, 100% tee, doesn't mean it cannot be true.
If it's absolutes you're needing, then I don't know what to tell you; unless you're willing to find Satoshi, get him to take a picture, along with his Japanese birth certificate, his SSN, and total proof that he is the creator of Bitcoin, so we can see, clearly, he is, in fact, a Japanese man from Japan, I cannot say he is Japanese, or that his name is really his. Hear-say is not good enough, due to the problem I described before: the concept of lying, being, people deliberately or inadvertently hiding the truth. Until this evidence is provided, I will proceed to doubt Satoshi's name is actually Satoshi, and I will doubt his nationality as being Japanese. You're right in saying, there's no good proof that he isn't Japanese, but you're also under the
assumption that he is. Right now, nobody knows to the absolute truth, including you.
Then this entire thread is pretty pointless.