You're convinced it's OPSEC. There's a theory Satoshi might've used it so it can't be dismissed but I don't follow it. I think Satoshi was a pseudonym for a team of geniuses who's used international English and GB British English because they lived in different countries.
I have read a lot about this and done a lot of digging around to try and see whom I think Satoshi is or was. I think there are two trains of thought, either Satoshi did a lot of things on purpose to throw people off, or there were a couple individuals who made up Satoshi. I know Satoshi once used the term "bloody" as in like "bloody hell". As an American I can tell you we never use that term here. So it makes you wonder. Personally I think that it was a combo of cypherpunks such as Hal Finney and Nick Szabo.
Probably it's the former, Satoshi is a genius remember so it's not like throwing off the scent isn't beyod his/her intellectual capacity because I mean if you really want to throw off people from identifying you, you will try to make it mych more simple rather than elaborate because sometimes it's better to hide in plain sight and much easier to pull off.