That's some real detective stuff. However do note that Satoshi is intelligent. And he could pleace fake clues so people can believe that and that 
Satoshi may be the mastermind behind bitcoin but even then thats not to say that his spelling might be poor. Its a good idea looking into spelling as clues but even people i know from the uk get confused with spelling and use us versions over uk ones . Probably not conclusive proof.
Generally if someone excels in computers and maths they do poorly in English writing skills because they spent most of their time learning programming. Most medical doctors spend at the minimum seven years doing medical training, but most of them write in illegible handwriting on prescriptions. Satoshi is a genius programmer, but said his writing skills weren't as good as his programming skills. He's probably awful at spelling, and used the default US spell checker in his browser.