Besides, FinCEN is part of the US government, whereas the Bank of Thailand is not part of the government.
And FinCEN is a part of the Dept of the Treasury, executive branch. Yes they do not make law, they do enforce it however, and so their guidance on how then intend to enforce it is instructive but not dispositive absent any definitive litigation and legislation.
In plain English, that means they are announcing (the guidance) what (they think) the current law means and they are likely to attempt to enforce it as such.
Judges may disagree. If it is Judge vs FinCEN, Judge wins. Congresscritters may disagree. If they pass some law that changes or refines the FinCEN guidance, that wins too (subject to it being ruled in court). In the final analysis, what happens in court matters most for criminal matters.