Earlier quoted context omitted.
I think that's a misleading litmus test. Only yen could be worked around through a prepaid card, stolen card number, gratis account, and probably other methods I'm not aware of. Lack of English support doesn't necessarily make the person Japanese. Westerners can learn Japanese or use translation tools.
Well, of course you can excuse it away (at the cost of adding complicating details and raising the question of why, if they used one of your suggestions, they later switched to the 21x more expensive Anonymousspeech hosting). The point of the test is to quickly asses whether the person trying to dox Satoshi has done even their basic homework and realized that it's an issue for their theory? If they haven't even looke…
The NSA is SN.
Crypto knowledge? Check.
Ability to hide identity? Check.
Cultural expertise? Check.
Everything else that could possibly be needed? Check!