2. If Satoshi were from the US, the easiest misdirection would be to pretend to be British. Learning the spelling and grammatical differences is not hard (or maybe test against a British spelling/grammar checker). Making sure you appear to be in a different timezone is basic operational security.
3. I would expect references to be intentional misdirections.
Nigerians, for example, follow this standard and they have 4 times the population of the UK.
And he was active - writing commits and emails - in UK hours, not American hours.
Is it some kind of US nationalism that insists on ignoring all this?
What are some examples of those?
However - his spelling was a bit inconsistent. The "Len Sassaman" theory is interesting - as he was known to write in a somewhat British style (for whatever reason) - but not consistently - and was in the right timezone at the time. Or perhaps Satoshi was a synthesis of multiple different people which would explain a lot of the inconsistency as well.
These coloquialisms are common in Africa/Asia. This is the case for most ex-colonies.